共查询到20条相似文献,搜索用时 31 毫秒
1.
V. V. Balashev V. V. Korobtsov T. A. Pisarenko L. A. Chebotkevich 《Technical Physics》2011,56(10):1501-1507
Magnetite polycrystalline films are grown by variously oxidizing a Fe film on the Si(111) surface covered by a thin (1.5 nm)
SiO2 layer. It is found that defects in the SiO2 layer influence silicidation under heating of the Fe film. The high-temperature oxidation of the Fe film results in the formation
of both Fe3O4 and iron monosilicide. However, the high-temperature deposition of Fe in an oxygen atmosphere leads to the growth of a compositionally
uniform Fe3O4 film on the SiO2 surface. It is found that such a synthesis method causes [311] texture to arise in the magnetite film, with the texture axis
normal to the surface. The influence of the synthesis method on the magnetic properties of grown Fe3O4 films is studied. A high coercive force of Fe3O3 films grown by Fe film oxidation is related to their specific morphology and compositional nonuniformity. 相似文献
2.
G. V. Kalinnikov R. A. Andrievski V. N. Kopylov D. Louzguine 《Physics of the Solid State》2008,50(2):374-378
Nanostructured and x-ray-amorphous films in the TiB2-B4C system are prepared by nonreactive magnetron sputtering in the absence and presence of an additional external magnetic field with inductions of up to 0.3 T. The properties of the deposited films, such as the grain size, phase composition, dominant texture, roughness, and hardness, are investigated using transmission electron microscopy, microdiffraction, x-ray powder diffraction, atomic force microscopy, and microdurometry. The specific features of the phase diagram as applied to films and the effect of application of the magnetic field on their properties are discussed. 相似文献
3.
B. Ghebouli S.-M. Chérif A. Layadi B. Helifa M. Boudissa 《Journal of magnetism and magnetic materials》2007
We present experimental results on the structural and magnetic properties of series of Fe thin films evaporated onto Si(1 1 1), Si(1 0 0) and glass substrates. The Fe thickness, t, ranges from 6 to110 nm. X-ray diffraction (XRD) and atomic force microscopy (AFM) have been used to study the structure and surface morphology of these films. The magnetic properties were investigated by means of the Brillouin light scattering (BLS) and magnetic force microscopy (MFM) techniques. The Fe films grow with (1 1 0) texture; as t increases, this (1 1 0) texture becomes weaker for Fe/Si, while for Fe/glass, the texture changes from (1 1 0) to (2 1 1). Grains are larger in Fe/Si than in Fe/glass. The effective magnetization, 4πMeff, inferred from BLS was found to be lower than the 4πMS bulk value. Stress induced anisotropy might be in part responsible for this difference. MFM images reveal stripe domain structure for the 110 nm thick Fe/Si(1 0 0) only. 相似文献
4.
The structure of polycrystalline Fe films grown on an oxidized Si(001) surface at room temperature has been studied by the technique of high-energy electron diffraction. It has been found that the grain orientation in the films depends of the amount of deposited iron. In Fe films less than 5 nm thick, grains have been found to be randomly oriented. Fe films more than 5 nm in thickness exhibit the (111) texture with an axis coinciding with the surface normal. The angular dispersion of the [111] direction in the Fe lattice from the surface normal is ±25°. It has been found that as the Fe films become thicker, the (111) texture changes to the (110) texture. 相似文献
5.
E. N. Sheftel’ S. V. Komogortsev R. S. Iskhakov P. K. Sidorenko L. A. Chekanova N. S. Perov A. N. Ivanov 《Bulletin of the Russian Academy of Sciences: Physics》2010,74(10):1449-1451
The magnetic properties (magnetization curve, ferromagnetic resonance spectrum) of nanocrystalline Fe79Zr10N11 films obtained by RF magnetron sputtering with subsequent annealing were studied experimentally, along with the fundamental
magnetic constants of these films (saturation magnetization M
S, local magnetic anisotropy energy K, and the exchange coupling constant A). The magnetic properties are discussed within the random magnetic model, which determines the correlation of the magnetic
properties with the fundamental magnetic constants and nanostructure parameters (grain size, magnetic anisotropy, and correlation
radius R
C). The exchange correlation length 2R
L
for the film magnetic microstructure was determined by correlation magnetometry. 相似文献
6.
A. A. Maximenko J. V. Kasiuk J. A. Fedotova M. Marszałek Y. Zabila J. Chojenka 《Physics of the Solid State》2017,59(9):1762-1770
We studied the structure and magnetic properties of porous multilayered Co/Pd films deposited on the templates of anodized Al2O3 with a specific surface morphology that is characterized by a cellular–porous structure with several pores inside each cell. X-ray diffraction analysis and reflectometry are used to study the peculiarities of the formation of phases in deposited films. The effect of morphological features of porous Co/Pd films on their magnetoanisotropic properties and magnetization reversal processes (magnetization reversal mechanisms, domain structure of films, and coercive field H c ) is revealed by SQUID magnetometry and magnetic force microscopy. 相似文献
7.
P. D. Kim I. A. Turpanov S. V. Stolyar R. S. Iskhakov V. I. Yushkov A. Ya. Beten’kova L. A. Li E. V. Bondareva T. N. Isaeva M. M. Karpenko 《Technical Physics》2004,49(4):431-434
The crystal structure and hysteretic magnetic properties of equiatomic single-crystal CoPt films applied on MgO substrates
by magnetron sputtering, as well as modification of these properties by thermal annealing, are studied. Heat-treated films
of thickness in the range 2<d≤16 nm exhibit perpendicular magnetic anisotropy. A correlation between the crystalline anisotropy constant of the CoPt films
and the order parameter of the LI0 superstructure in these alloys is found. The effect of a single-crystalline MgO substrate on the structure and magnetic properties
of equiatomic CoPt films is revealed. 相似文献
8.
R. Steiner H.-G. Boyen M. Krieger A. Plettl P. Widmayer P. Ziemann F. Banhart R. Kilper P. Oelhafen 《Applied Physics A: Materials Science & Processing》2003,76(1):5-13
[Fe/B]n ≥2 multilayers were prepared by thermal evaporation, ion-beam sputtering and laser ablation. By applying in situ electron spectroscopies
(UPS, XPS) and monitoring the electrical resistance during layer growth, evidence could be provided for the occurrence of
interface reactions within the range of studied deposition temperatures (77 K ≤T ≤300 K). These reactions result in amorphous
FexB100-x phases, which are spatially restricted to a width of less than 3 nm at the original interface. The amorphicity of the reacted
interlayers was unequivocally proven by additional high-resolution electron microscopy (HRTEM) and their characteristically
changed magnetic properties. Due to the well-defined width of the interface reaction, homogeneous amorphous FexB100-x films can be obtained by reducing the individual Fe and B layer thicknesses to below the above reaction depth, while for
larger thicknesses layer sequences of the crystalline/amorphous/crystalline type will result.
Received: 30 January 2002 / Accepted: 31 January 2002 / Published online: 10 September 2002
RID="*"
ID="*"Corresponding author. Fax: +49-731/502-2963, E-mail: hans-gerd.boyen@physik.uni-ulm.de 相似文献
9.
Zn0.93Co0.07O thin films infiltrated with nitrogen and aluminum were prepared by means of magneton sputtering. The structural and magnetic
properties of the films were studied systematically. The materials were single phase (wurtzite structure) with surfaces showing
signs of homogeneous growth. The films were ferromagnetic at room temperature, and magnetic domains could be clearly observed
on the surfaces. In the case of Al infiltration, saturated magnetization increased with Al concentration increasing; whereas
in the case of N infiltration, saturated magnetization decreased with the increase in N concentration. The results show that
ferromagnetic interactions in Co-doped ZnO diluted magnetic semiconductor may be transferred by electrons.
Supported by the National Natural Science Foundation of China (Grant No. 10674059) and the Major Project of National Basic
Research Program of China (Grant No. 2005CB623605) 相似文献
10.
The magnetic and structural properties of epitaxial Fe films grown on Si(1 1 1) are investigated by polarized neutron reflectometry (PNR) at room temperature. The influence of different types of interfaces, Fe/Si, Fe/FeSi2 and Au/Fe on the magnetic properties of Fe films deposited by molecular beam epitaxy onto Si(1 1 1) are characterized. We observe a drastic reduction of the magnetic moment in the entire Fe film deposited directly on the silicon substrate essentially due to strong Si interdiffusion throughout the whole Fe layer thickness. The use of a silicide FeSi2 template layer stops the interdiffusion and the value of the magnetic moment of the deposited Fe layer is close to its bulk value. We also evidence the asymmetric nature of the interfaces, Si/Fe and Fe/Si interfaces are magnetically very different. Finally, we show that the use of Au leads to an enhancement of the magnetization at the interface. 相似文献
11.
V. G. Myagkov K. P. Polyakova G. N. Bondarenko V. V. Polyakov 《Physics of the Solid State》2003,45(1):138-140
The classical solid-phase reaction between Fe2O3 and Al layers in thin films is initiated. It is shown that, in the reaction products, Fe granulated films are formed in the Al2O3 nonconducting matrix. Analysis of the reaction equation demonstrates that the volume fraction of iron in the granulated films is less than the percolation threshold. This determines the magnetic properties of iron clusters in a superparamagnetic state. It is assumed that the nanocrystalline microstructure exists in thin films after solid-phase reactions proceeding under conditions of self-propagating high-temperature synthesis. 相似文献
12.
Mitsuru Ohtake Kouhei Shikada Fumiyoshi Kirino Masaaki Futamoto 《Journal of magnetism and magnetic materials》2008
Co(0 0 0 1)hcp/Fe(1 1 0)bcc epitaxial magnetic bi-layer films were successfully prepared on SrTiO3(1 1 1) substrates. The crystallographic properties of Co/Fe epitaxial magnetic bi-layer films were investigated. Fe(1 1 0)bcc soft magnetic layer grew epitaxially on SrTiO3(1 1 1) substrate with two type variants, Nishiyama–Wasserman and Kurdjumov–Sachs relationships. An hcp-Co single-crystal layer is obtained on Ru(0 0 0 1)hcp interlayer, while hcp-Co layer formed on Au(1 1 1)fcc or Ag(1 1 1)fcc interlayer is strained and may involve fcc-Co phase. It has been shown possible to prepare Co/Fe epitaxial magnetic bi-layer films which can be usable for patterned media application. 相似文献
13.
Daniel Grant Michael Ryan Amlan Biswas 《The European Physical Journal B - Condensed Matter and Complex Systems》2018,91(9):197
The perovskite material (La0.4Pr0.6)0.67Ca0.33MnO3 (LPCMO) has complex electronic and magnetic behavior based on phase competition between ferromagnetic metallic (FMM) and insulating phases with similar free energies. Experimental evidence has indicated that in-plane stress anisotropy influences these phases and can affect electronic and magnetic properties. Here we investigate the roles that both stress and shape anisotropies may play in controlling the coercive field of the material. LPCMO thin films of various thicknesses (20, 25, and 30 nm) were deposited on (110) NdGaO3 (NGO) substrates using pulsed laser deposition and the coercive fields were measured. Photolithography was then used to fabricate microstructured arrays of LPCMO on the NGO substrates for each of the films. The coercive fields of these arrays of LPCMO were compared to the behavior of the corresponding unpatterned LPCMO thin films across a range of temperatures. Microstructure arrays for the thicker (25 and 30 nm) films showed a substantial increase in the coercive field after forming the arrays, whereas a thinner film (20 nm) showed almost no change in the coercive field. Stress anisotropy continues to play a dominant role in the behavior of LPCMO thin films and dimensionality of the magnetic domains also influences the results. The films show 2D behavior when film thickness approaches the size of the critical radius for single-to-multidomain transitions. Making thicker films allows for 3D behavior and a role for shape anisotropy to influence the coercive fields. 相似文献
14.
M. Belmeguenai S. Mercone C. Adamo T. Chauveau L. Méchin P. Monod P. Moch D. G. Schlom 《Journal of nanoparticle research》2011,13(11):5669-5675
Nearly 50-nm thick La0.7Sr0.3MnO3 (LSMO) films were grown on Si substrates using molecular beam epitaxy on (001) Si substrates over-layered by a 20 nm thick
SrTiO3 (STO) or by a 20 nm thick CaTiO3 (CTO) film. In addition, a reference LSMO film was directly deposited on a (001) STO substrate by pulsed laser deposition.
For all the samples, X-ray diffraction revealed an excellent epitaxy of the LSMO film and small mosaicity around (001), with
in-plane [100] and [010] cubic axes. The LSMO/CTO films are in-plane compressed while the LSMO/STO ones are in-plane extended.
The temperature dependence of their static magnetic properties was studied using a SQUID, showing a Curie temperature overpassing
315 K for all the samples. Hysteresis loops performed at room temperature (294 K) with the help of a vibrating sample magnetometer
(VSM) are also discussed. At 294 K Micro-strip ferromagnetic resonance (MS-FMR) was used to investigate the dynamic magnetic
properties. It allows concluding to a strong anisotropy perpendicular to the films and to a weak fourfold in-plane anisotropy
with easy axes along the [110] and [1[`1]0 1\bar{1}0 ] directions. Their values strongly depend on the studied sample and are presumably related to the strains suffered by the
films. 相似文献
15.
Karol Załęski Janusz Dubowik Iwona Gościańska Bartłomiej Andrzejewski Tomasz Toliński 《Central European Journal of Physics》2011,9(2):558-561
In this paper we report structural, magnetic and transport properties of strongly textured Ni51Mn36Sn13 thin films. The off-stoichiometric Heusler alloy films with 200 nm thickness were sputter-deposited on a MgO(100) substrate
at 500 K and after annealed at 1000 K in UHV conditions. The textured growth was confirmed by x-ray diffraction in Bragg-Brentano
geometry. The temperature dependence of the magnetic properties was measured by VSM and FMR methods. The electron transport
measurements were carried out in function of temperature in 0 Oe and 50 kOe fields. All measurements corroborate the existence
of the martensitic transformation in the film. Furthermore, transport measurements reveal an influence of the magnetic field
on the transition temperature. 相似文献
16.
Fujun Yang Hao Wang Baoyuan Wang Haoshuang Gu Mingjie Zhou Quan Li Yong Jiang 《Applied Physics A: Materials Science & Processing》2009,94(4):981-985
FePt/B4C multilayer films with different single FePt layer thickness were prepared by magnetron sputtering and subsequently annealing
in vacuum. Influence of single FePt layer thickness on microstructure and magnetic property of FePt/B4C films is investigated. Experimental results suggest that the Fe and Pt rich regions will appear in the interior of single
FePt layer. The increasing of FePt layer thickness leads to the increase of grain size and volume fraction of order phase f
0, which eventually induce satisfied coercivity (5.8 kOe). 相似文献
17.
V. V. Randoshkin A. M. Saletsky N. N. Usmanov D. B. Chopornyak 《Physics of the Solid State》2004,46(3):474-478
Photoresponse was used to study the influence of an in-plane magnetic field on pulsed magnetization reversal and relaxation in single-crystal (Bi,Lu)3(Fe,Ga)5O12 films with (210) orientation. Dynamic domain structures were observed using high-speed photography. 相似文献
18.
K.W. Liu D.Z. Shen J.Y. Zhang B.S. Li X.J. Wu Q.J. Feng Y.M. Lu X.W. Fan 《Journal of magnetism and magnetic materials》2006
Fe films with strong preferred orientation were prepared on Al2O3 (0 0 0 1) substrates by a new two-step method using low-pressure metal-organic chemical vapor deposition (LP-MOCVD) method. X-ray diffraction (XRD) and a vibrating sample magnetometer were employed to characterize the structure and magnetic properties of the Fe films before and after thermal reduction, which was performed in hydrogen flow at 723–1023 K. XRD patterns indicate that the films changed into α-Fe (bcc) mono-phase from a mixture of α-Fe2O3 and/or Fe (bcc). 相似文献
19.
P. Tiberto L. Boarino F. Celegato M. Coisson E. Enrico N. de Leo F. Vinai P. Allia 《Journal of nanoparticle research》2011,13(9):4211-4218
Array of dots have been designed by assembling a monolayer of polystyrene nanospheres (PN) on sputtered thin films having
Ni80Fe20 and Co composition with different thickness, ranging in the interval 20 ÷ 80 nm. Subsequently the films are nanopatterned
using the nanospheres as a mask during sputter etching with Ar+ ions. A Reactive Ion Etching (RIE) process before sputter etching is used to control the final diameter of the magnetic dots
that thus can be tailored as desired (typically ranging in the interval 250 ÷ 400 nm depending on the PN starting diameter).
In addition, electron beam lithography has been exploited to obtain arrays of dots in Ni80Fe20 thin films having approximately the same mean size and dot distance as in self-assembled samples. All films have been routinely
characterized by SEM and AFM microscopy to evaluate the microstructure. Magnetic domain patterns at magnetic remanence and
in the demagnetised state have been imaged by MFM microscopy technique. Room-temperature hysteresis properties have been measured
by an alternating gradient force magnetometer. In general, the magnetization process in all patterned films has been observed
to have features typical of a vortex whose nucleation field depends on sample thickness and mean dot dimension. A comparison
between magnetic arrays of Ni80Fe20 dots prepared by self-assembling of polystyrene nanospheres and electron beam lithography is presented to rule out the role
of microstructure (i.e., order, size, and mutual distance of the magnetic dots) on magnetic properties. 相似文献
20.
I. A. Gudim A. A. Demidov E. V. Eremin D. K. Shukla 《Physics of the Solid State》2018,60(10):1989-1998
The magnetic and magnetodielectric properties of Ho0.5Nd0.5Fe3(BO3)4 ferroborate with the competing Ho–Fe and Nd–Fe exchange couplings have been experimentally and theoretically investigated. Step anomalies in the magnetization curves at the spin-reorientation transition induced by the magnetic field B ║ c have been found. The spontaneous spin-reorientation transition temperature TSR ≈ 8 K has been refined. The measured magnetic properties and observed features are interpreted using a single theoretical approach based on the molecular field approximation and calculations within the crystal field model of the rare-earth ion. Interpretation of the experimental data includes determination of the crystal field parameters for Ho3+ and Nd3+ ions in Ho0.5Nd0.5Fe3(BO3)4 and parameters of the Ho–Fe and Nd–Fe exchange couplings. 相似文献