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1.
S. I. Yushchuk 《Technical Physics》1999,44(12):1454-1456
The layered structure of yttrium iron garnet films, ranging in thickness from 0.7 to 4.1 μm, grown epitaxially on single-crystal
gallium-gadolinium garnet substrates, was investigated by x-ray spectral microanalysis. The ferrite films were chemically
etched layer by layer in a mixture of orthophosphoric and sulfuric acids at T=353–423 K. It was established that the chemical composition of the films varies over the thickness because of the nonuniform
distribution of gadolinium, gallium, lead, and platinum ions; the film-substrate transitional layer and the surface layer
of the film differ most greatly with respect to the composition and magnetic properties. It was shown that the thickness of
the transitional layers and their negative effect on the magnetic characteristics of ferrite films decrease appreciably if
at the time of immersion of the substrate and pulling of epitaxial structure out of the fluxed solution the substrate holder
together with a special mixer rotate at a rate of 50 rpm and the pulling velocity is 20 cm/min.
Zh. Tekh. Fiz. 69, 62–64 (December 1999) 相似文献
2.
E. Popova N. Keller F. Jomard L. Thomas M.-C. Brianso F. Gendron M. Guyot M. Tessier 《The European Physical Journal B - Condensed Matter and Complex Systems》2003,31(1):69-74
Magnetic exchange coupling has been observed for ultrathin films of yttrium iron garnet (Y3Fe5O12 or YIG). Single-crystalline YIG films were prepared on yttrium aluminium garnet (Y3Al5O12 or YAG) substrates by pulsed laser deposition. (111) and (110) oriented substrates were used. Film thicknesses were varied
from 180 ? to 4600 ?. Epitaxial growth of YIG on YAG was obtained in spite of the lattice mismatch of 3%. Magnetic hysteresis
loops recorded for ultrathin YIG films have a “bee-waist” shape and show a coupling between two different magnetic phases.
The first phase is magnetically soft YIG. A composition study by secondary ion mass spectroscopy shows the second phase to
be Y3Fe5-xAlxO12 due to the interdiffusion of Fe and Al at the film/substrate interface. This compound is known to be magnetically harder
and to have weaker magnetization than YIG. The coupling of the two phases leads to a hysteresis loop displacement at low temperatures.
This displacement varies differently with film thickness for two substrate orientations. Assuming an interfacial coupling,
the maximal interaction energy is estimated to be about 0.17 erg/cm2 at 5 K for (111) oriented sample.
Received 3 June 2002 / Received in final form 7 October 2002 Published online 27 January 2003
RID="a"
ID="a"Presently at LPM, Université H. Poincaré, BP 239, 54506 Vandœuvre-lès-Nancy e-mail: popova@lpm.u-nancy.fr 相似文献
3.
V. T. Dovgii T. G. Astaf’eva F. G. Bar’yakhtar G. I. Yampol’skaya 《Technical Physics》1997,42(9):1085-1087
The effect of external planar radial pressure on the thermal stability of the magnetic parameters of epitaxial iron garnet
films is investigated in the temperature range 200–500 K for external mechanical stresses in the range 0–40 kgf/mm2. It is shown that external planar radial pressure can be used to improve the thermal stability of these magnetic parameters
by a factor of 1.5–2, and also to alter significantly the temperature interval of single-domain behavior for orientational
phase transitions near a compensation point.
Zh. Tekh. Fiz. 67, 114–116 (September 1997) 相似文献
4.
V. V. Danilov D. L. Lyfar' Yu. V. Lyubon'ko A. Yu. Nechiporuk S. M. Ryabchenko 《Russian Physics Journal》1989,32(4):276-280
The temperature dependence (4.2–300 K) of ferromagnetic resonance (FMR) in the 3-cm range in films of yttrium-iron garnet (YIG)1.7–3 m thick, epitaxially grown on a paramagnetic gadolinium-gallium garnet (GGG) paramagnetic substrate is studied. It is found that with decrease in temperature, beginning at T 70 K, the temperature dependences of the resonant FMR fields
res
and
res
for magnetic fields applied parallel and perpendicular to the normal to the film deviate from similar dependences for a free thin YIG plate, which approach the value of / for YIG. This deviation increases approximately in proportion to T–1, reaching hundreds of Oe at T=4.2 K. It is established that the given effect is related to the additional static magnetic field Hp created in the YIG film by the paramagnetic substrate, and is dependent on the form of the latter.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 4, pp. 48–53, April, 1989. 相似文献
5.
F. V. Lisovskii E. G. Mansvetova M. P. Temiryazeva A. G. Temiryazev 《JETP Letters》2013,96(9):596-600
The distribution of the magnetization vector on the free surface and end (cleaved facet) of thick epitaxial yttrium iron garnet films has been studied by the scanning magnetic-force microscopy method. Volume fractal-like branching of the domain structure has been found at the interface of the film and the free space with the refinement of the formed partial branches of the stripe (labyrinth) domains. Triangular closing domains have been observed at the interface between the film and the substrate. Direct experimental proof of the existence of the static horizontal Bloch lines within the stripe domain walls has been obtained. 相似文献
6.
B.R. Tittmann 《Solid State Communications》1973,13(4):463-466
In ferromagnetic resonance experiments of yttrium—iron—garnet films, resonances have been observed whose characteristics are consistent with their interpretation as magnetostatic surface spin wave modes. 相似文献
7.
A modified wavelength modulation spectroscopy(WMS)based on the self-heating effect of the tunable diode laser when driven in quasi-continuous-wave(QCW)mode is investigated.A near-infrared distributed feedback(DFB)diode laser working at the QCW mode is employed as the QCW light source,and CO2 is selected as the target gas.The characteristic of the QCW second harmonic(2f)line profile is analyzed through a comparison with that of the traditional CW WMS with the same system.A noise-equivalent absorbance of 3.2×10-5 Hz-1/2 for CO2 at 1.58μm is obtained with 18-m optical path.The QCW WMS lowers the dependence on lasers and expands selectivity,thus verifying the feasibility of the method. 相似文献
8.
9.
Haruo Ishikawa Kazuhiro Nakajima Katsumi Machida Atuo Tanii 《Optical and Quantum Electronics》1990,22(6):517-528
Using Bi-substituted rare-earth iron garnet film, (GdBi)3 (FeAlGa)5O12 or (YbTbBi)3 Fe5O12, grown by liquid phase epitaxy technique, we have fabricated a compact, low cost and high performance optical isolator for near-infrared wavelength region, in comparison with conventional isolator using yttrium iron garnet (YIG) single crystal as Faraday rotator. Typical insertion loss and isolation of developed isolators are 0.6 dB and 35 dB respectively at =1.31 m and the size is 6×6 mm. The isolators, which could be used in the wavelength range of 1.31 to 1.55 m, are also fabricated with insertion loss of less than 1.1 dB and isolation of more than 35 dB. 相似文献
10.
V. V. Randoshkin R. M. Alparov N. V. Vasil’eva V. N. Kolobanov V. V. Mikhaĭlin N. N. Petrovnin D. A. Spasskiĭ N. N. Sysoev 《Physics of the Solid State》2006,48(11):2097-2099
The luminescence excited by synchrotron radiation in gadolinium gallium garnet single-crystal films grown by liquid-phase epitaxy from lead-and bismuth-containing solution melts on Gd3Ga5O12 substrates is investigated. It is shown that the luminescence intensity in the visible range of the spectrum depends on the type and concentration of impurity ions passing from the solvent into the film. 相似文献
11.
It has been found using the Faraday-effect magneto-optic method that the width of magnetic domains of the labyrinth domain
structure in bismuth-containing iron garnet films with perpendicular anisotropy changes considerably after the adsorption
of methanol molecules. A maximum change in domain width of 50% has been observed in methanol saturated vapor. This effect
is reversible. A decrease in domain width under adsorption has been attributed to a decrease in the effective constant of
the perpendicular magnetic anisotropy of the film caused by the adsorption of methanol molecules. 相似文献
12.
V. F. Shkar’ E. I. Nikolaev V. N. Sayapin A. I. Linnik V. P. Denysenkov A. M. Grishin S. I. Khartsev 《Physics of the Solid State》2005,47(6):1107-1110
Ferromagnetic resonance (FMR) and vibrating-sample magnetometer techniques were used to study the nature of the structural characteristics of yttrium iron garnet films deposited through either liquid phase epitaxy or laser evaporation on a (111)-oriented gallium gadolinium garnet substrate. It was proved that, based on the experimentally observed cubic magnetic anisotropy, deposited films should be considered to be single crystals. However, the absence of the FMR domain branch in a nonsaturated film and the shape of the magnetization curve indicate that a deposited film when demagnetized does not have a domain structure, as would be expected for a single-crystal film. According to the model proposed, a deposited film consists of close-packed single-crystal fragments with equal crystallographic orientation, the boundaries between which are in a partially atomically disordered state. As a result, such a film is both locally and macroscopically anisotropic, like a continuous single crystal. This film can split into domains only within a fragment (as is the case in a magnetic granular polycrystal); however, this does not happen, because the linear dimensions of a submicroscopic fragment are smaller than the equilibrium domain width. 相似文献
13.
The induction of an Anger state (AS) in a multidomain magnetic medium by a static bias magnetic field is observed. The properties
of the spiral dynamic domains in the induced AS are substantially different from those of previously studied spiral domains.
Pis’ma Zh. éksp. Teor. Fiz. 65, No. 1, 60–64 (10 January 1997) 相似文献
14.
Spectral and luminescence properties of gadolinium gallium garnet epitaxial films doped with terbium
N. V. Vasil’eva V. V. Randoshkin V. N. Kolobanov E. B. Kryukova V. V. Mikhaĭlin N. N. Petrovnin V. G. Plotnichenko Yu. N. Pyrkov D. A. Spasskiĭ N. N. Sysoev 《Physics of the Solid State》2007,49(3):478-483
Gadolinium gallium garnet single-crystal films containing terbium are grown through liquid-phase epitaxy from a supercooled solution melt in the PbO-B2O3 system. The optical absorption spectra in the wavelength range 0.2–10.0 μm and the luminescence spectra excited by synchrotron radiation with energies in the range 3.5–30.0 eV are investigated at temperatures of 10 and 300 K. It is revealed that the optical absorption spectra contain an absorption band with the maximum at a wavelength λ ≈0.260 μm, which corresponds to the spin-allowed electric dipole transition between the electronic configurations 4f 8(7 F 6) → 4f 7(8 S)5d of the Tb3+ ions. The narrow low-intensity absorption bands attributed to the 4f → 4f transitions from the 7 F 6 ground level to the 7 F 0–5 multiplet levels of the Tb3+ ions are observed in the wavelength range 1.7–10.0 μm. In the luminescence spectra measured at a temperature of 10 K, the highest intensity is observed for a band with the maximum at a wavelength λ ≈ 0.544 μm, which is associated with the 5 D 4 → 7 F 5 radiative transition in the Tb3+ ion. 相似文献
15.
We present a tunable wideband bismuth-substituted yttrium iron garnet (Bi-YIG) waveguide magneto-optic (MO) modulator. High-speed current transients are used to switch the in-plane magnetization of the film, which modulates an 800 nm optical beam. Large bandwidth optical modulation is achieved by driving the device in a non-resonant mode that is well below the ferromagnetic resonance frequency of the film. The MO modulator has the potential of operating at bandwidths higher than 1 GHz by tuning the applied static magnetic field. 相似文献
16.
V. F. Shkar’ V. P. Denisenkov A. M. Grishin A. A. Yalali S. I. Khartsev E. I. Nikolaev V. N. Sayapin 《Physics of the Solid State》2003,45(12):2334-2337
Bismuth iron garnet films prepared through electron-beam and laser-induced evaporation on (001)-oriented substrates of scandium gallium gadolinium garnet are investigated using ferromagnetic resonance. It is assumed that the additional minima observed in the angular dependence of the resonance field can be associated with the magnetic moment of bismuth ions. 相似文献
17.
The longest relaxation time and sharpest frequency content in ferromagnetic precession is determined by the intrinsic (Gilbert) relaxation rate G. For many years, pure iron (Fe) has had the lowest known value of G = 57 MHz for all pure ferromagnetic metals or binary alloys. We show that an epitaxial iron alloy with vanadium (V) possesses values of G which are significantly reduced to 35 +/- 5 MHz at 27% V. The result can be understood as the role of spin-orbit coupling in generating relaxation, reduced through the atomic number Z. 相似文献
18.
Spectra of the second and third optical harmonics generated in epitaxial films of magnetic garnets were studied in the ranges 1.7–3.2 and 2.4–4.2 eV, respectively. A large magnetic contrast was revealed in second-optical-harmonic spectra, which reaches 100% at certain photon energies. By contrast, the symmetry-allowed magnetic contribution to spectra of the third optical harmonic was not found. While linear absorption in ferrite-garnet films grows by two orders of magnitude above the fundamental absorption edge at ~3.2 eV, the intensity of nonlinear spectra did not reveal any noticeable increase over this spectral range. 相似文献
19.
V. Doormann J. -P. Krumme C. -P. Klages M. Erman 《Applied Physics A: Materials Science & Processing》1984,34(4):223-230
Refractive-index and optical-absorption spectra of Bi-substituted yttrium iron garnet films, epitaxially grown by liquid-phase epitaxy, have been measured in the spectral regime 0.26 m1.9 m by thin-film interference for 0.52 m and by ellipsometry for0.52 m. The Y3–x–y
Bi
x
Pb
y
Fe5–z
Pt
z
O12 films contain bismuth in the range Ox 1.42, lead in the range 0.01 y0.08 and platinum in the range 0.005<=z0.03. There is satisfactory coincidence between the results from ellipsometry and thin-film interference in the overlapping wavelength region. The materials investigated are the same as reported earlier from this laboratory in ter mof their magnetic and magnetooptic properties. 相似文献
20.
K. Sun X. Chao R. Sur J. B. Jeffries R. K. Hanson 《Applied physics. B, Lasers and optics》2013,110(4):497-508
A general model for 1f-normalized wavelength modulation absorption spectroscopy with nf detection (i.e., WMS-nf) is presented that considers the performance of injection-current-tuned diode lasers and the reflective interference produced by other optical components on the line-of-sight (LOS) transmission intensity. This model explores the optimization of sensitive detection of optical absorption by species with structured spectra at elevated pressures. Predictions have been validated by comparison with measurements of the 1f-normalized WMS-nf (for n = 2–6) lineshape of the R(11) transition in the 1st overtone band of CO near 2.3 μm at four different pressures ranging from 5 to 20 atm, all at room temperature. The CO mole fractions measured by 1f-normalized WMS-2f, 3f, and 4f techniques agree with calibrated mixtures within 2.0 %. At conditions where absorption features are significantly broadened and large modulation depths are required, uncertainties in the WMS background signals due to reflective interference in the optical path can produce significant error in gas mole fraction measurements by 1f-normalized WMS-2f. However, such potential errors can be greatly reduced by using the higher harmonics, i.e., 1f-normalized WMS-nf with n > 2. In addition, less interference from pressure-broadened neighboring transitions has been observed for WMS with higher harmonics than for WMS-2f. 相似文献