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- Title
Structural and magnetic features of solid-phase transformations in Mn/Bi and Bi/Mn films.
- Authors
Myagkov, V.; Bykova, L.; Yakovchuk, V.; Zhigalov, V.; Volochaev, M.; Matsynin, A.; Tambasov, I.; Seredkin, V.; Patrin, G.; Bondarenko, G.
- Abstract
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 ≃ 1.5 × 10 erg/cm) and a coercive force H > H ~ 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.
- Subjects
PHASE transitions; MAGNETIC properties of thin films; MANGANESE; POLYCRYSTALS; X-ray diffraction; ELECTRON microscopy; PERPENDICULAR magnetic anisotropy
- Publication
JETP Letters, 2016, Vol 103, Issue 4, p254
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/S0021364016040111