排序方式: 共有9条查询结果,搜索用时 46 毫秒
1
1.
V. S. Zhigalov L. E. Bykova V. G. Myagkov A. N. Pavlova M. N. Volochaev A. A. Matsynin G. S. Patrin 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2020,14(1):47-53
The structure and magnetic properties of CoPt–Al2O3 nanocomposite films synthesized by the annealing of Al/(Co3O4 + Pt) bilayers on a MgO(001) substrate at 650°C in vacuum are investigated. The synthesized composite films contain ferromagnetic CoPt grains with an average size of 25–45 nm enclosed in a nonconducting Al2O3 matrix. The saturation magnetization (Ms ~ 330 G) and coercivity (Hc ≈ 6 kOe) of the films are measured in the film plane and perpendicular to it. The obtained films are characterized by a spatial rotational magnetic anisotropy, which makes it possible to arbitrarily set the easy magnetization axis in the film plane or perpendicular to it using a magnetic field stronger than the coercivity (H > Hc). 相似文献
2.
Volochaev M. N. Komogortsev S. V. Myagkov V. G. Bykova L. E. Zhigalov V. S. Shestakov N. P. Velikanov D. A. Smolyakov D. A. Luk’yanenko A. V. Rachek V. B. Loginov Yu. Yu. Tambasov I. A. Matsynin A. A. 《Physics of the Solid State》2018,60(7):1425-1431
The results of structural and magnetic investigations of nanogranular Co–Al2O3 films formed from Co3O4/Al thin-film layered structures upon vacuum annealing are reported. The Co3O4/Al films have been obtained by sequential reactive magnetron sputtering of a metallic cobalt target in a medium consisting of the Ar + O2 gas mixture and magnetron sputtering of an aluminum target in the pure argon atmosphere. It is shown that such a technique makes it possible to obtain nanogranular Co–Al2O3 single- and multilayer thin films with a well-controlled size of magnetic grains and their distribution over the film thickness.
相似文献3.
V. S. Zhigalov V. G. Myagkov O. A. Bayukov L. E. Bykova G. N. Bondarenko A. A. Matsynin 《JETP Letters》2009,89(12):621-625
The solid-phase synthesis in epitaxial Mn/Fe(001) bilayer film systems with 24 at % of Mn has been shown to start at a temperature of 220°C with the formation of a γ-austenite lattice and the Mn and Fe films react completely under annealing to 600°C. In the sample cooling process after annealing below 220°C, the γ austenite undergoes a martensitic transformation to an oriented ∈(100) martensite. When the annealing temperature is increased above 600°C, Mn atoms migrate from the γ-lattice, which becomes unstable, and the film is partially again transformed to the epitaxial Fe(001) layer. The solid-phase synthesis in Mn/Fe(001) bilayer nanofilms and multilayers is assumingly determined by the inverse ε → γ martensitic transformation in the Mn-Fe system. The existence of a new low-temperature (~220°C) structure transition in the Mn-Fe system with a high iron content is assumed. 相似文献
4.
5.
V. G. Myagkov L. E. Bykova V. Yu. Yakovchuk V. S. Zhigalov M. N. Volochaev A. A. Matsynin I. A. Tambasov V. A. Seredkin G. S. Patrin G. N. Bondarenko 《JETP Letters》2016,103(4):254-259
Solid-phase transformations at different annealing temperatures in Mn/Bi (Mn on Bi) and Bi/Mn (Bi on Mn) films have been studied using X-ray diffraction, electron microscopy, and magnetic measurements. It has been shown that the synthesis of the α-MnBi phase in polycrystalline Mn/Bi films begins at a temperature of ~120°C and the Mn and Bi layers react completely at 300°C. The resulting α-MnBi(001) samples have a large perpendicular magnetic anisotropy (K u ? 1.5 × 107 erg/cm3) and a coercive force H > H C ~ 3 kOe. In contrast to Mn/Bi, the ferromagnetic α-MnBi phase in Bi/Mn films is not formed even at annealing processes up to 400°C and Mn clusters are formed in a Bi melt. This asymmetry in phase transformations occurs because chemosorbed oxygen existing on the surface of the Mn film in Bi/Mn films suppresses a solid-phase reaction between Mn and Bi. The analysis of the results obtained implies the existence of new low-temperature (~120°C) structural transformation in the Mn–Bi system. 相似文献
6.
Bykova L. E. Zhigalov V. S. Myagkov V. G. Volochaev M. N. Matsynin A. A. Bondarenko G. N. Patrin G. S. 《Physics of the Solid State》2018,60(10):2072-2077
Physics of the Solid State - The structural and magnetic properties of granular Co–In2O3 nanocomposite films formed by vacuum annealing of In/Co3O4 film bilayers at a temperature of... 相似文献
7.
Zhigalov V. S. Myagkov V. G. Bykova L. E. Bondarenko G. N. Matsynin A. A. Volochaev M. N. 《Physics of the Solid State》2017,59(2):392-398
Physics of the Solid State - The structural and magnetic properties of Fe87Pt13 films synthesized by solid-state reactions and Fe87Pt13–Al2O3 composite films fabricated by aluminothermy are... 相似文献
8.
V. G. Myagkov V. S. Zhigalov A. A. Matsynin L. E. Bykova G. V. Bondarenko G. N. Bondarenko G. S. Patrin D. A. Velikanov 《JETP Letters》2012,96(1):40-43
Results of an X-ray diffraction study as well as magnetic and electrical measurements of the solid-state reactions in Ge/Mn polycrystalline films of an 80/20 atomic composition have been presented. It has been shown that the ferromagnetic Mn5Ge3 phase is formed first on the Ge/Mn interface after annealing at ??120°C. The further increase in the annealing temperature to 300°C leads to the beginning of the synthesis of the Mn11Ge8 phase, which becomes dominating at 400°C. The existence of new structural transitions in the Mn-Ge system in the region of ??120 and ??300°C has been predicted on the basis of the presented results and results obtained earlier when studying solid-state reactions in different film structures. The supposition about the general chemical mechanisms of the synthesis of the Mn5Ge3 and Mn11Ge8 phases during the solid-state reactions in the Ge/Mn films of the 80/20 atomic composition and the phase separation in Ge x Mn1 ? x (x > 0.95) diluted semiconductors has been substantiated. 相似文献
9.
V. G. Myagkov L. E. Bykova V. Yu. Yakovchuk A. A. Matsynin D. A. Velikanov G. S. Patrin G. Yu. Yurkin G. N. Bondarenko 《JETP Letters》2017,105(10):651-656
The variations of the structural and magnetic properties of Bi/Mn/Bi and Mn/Bi/Mn trilayer film systems of equiatomic composition in the process of vacuum annealing are studied. The annealing of Bi/Mn/Bi films at a temperature of 270°C for an hour results in the synthesis of the well-studied highly oriented low-temperature LT-MnBi(001) phase with the perpendicular magnetic anisotropy K u ~ 1.1 × 107 erg/cm3 and coercivity H C ~ 1.5 kOe. In contrast to Bi/Mn/Bi, polycrystalline LT-MnBi nanoclusters are formed in Mn/Bi/Mn films under the same annealing conditions. A high rotatable magnetic anisotropy exceeding the shape anisotropy is detected in the films under consideration: the easy axis of anisotropy with the inclusion of the delay angle in magnetic fields above the coercivity H > H C = 9.0 kOe can be oriented in any spatial direction. It is shown that the nature of rotatable magnetic anisotropy is due to the structural coexistence of epitaxially coupled LT-MnBi and QHTP-Mn1.08Bi phases. The reported experimental results indicate the existence of a new class of ferromagnetic film media with the spatially tunable easy axis. 相似文献
1