Magnetic moment of a?-Fe16N2 films (invited)
Magnetic moment of a?-Fe16N2 films (invited)
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DOI：
10.1063/1.358431
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发表时间：
1994-11
期刊：
影响因子：
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通讯作者：
M. Takahashi;H. Shoji;Hironobu Takahashi;H. Nashi;T. Wakiyama;M. Doi;M. Matsui
中科院分区：
文献类型：
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作者：
M. Takahashi;H. Shoji;Hironobu Takahashi;H. Nashi;T. Wakiyama;M. Doi;M. Matsui
为了确定α‘相的本征磁矩，在不同的反应溅射条件下制备了不同N含量的N-马氏体膜。讨论了(α‘+α’)-Fe_(16)N_2薄膜的磁矩与BCT结构的晶胞体积和N-马氏体中N位有序度的关系。结果表明：(1)薄膜具有与块体α‘-Fe16N_2相同的结构；(2)σ’相的饱和磁化强度α‘随α’相的晶胞体积增大而增加约4%；(3)N位从α‘到α’-Fe16N_2的有序度对σS的影响不大。(4)实验测得(σ‘)-Fe_(16)N_2薄膜的α’+αS的最大值为232emu/g，在300K时，σS在α‘相(完全有序状态)的本征值不超过240emu/g。
In order to determine the value of the intrinsic magnetic moment of the α ‘ phase, the films of nitrogen‐martensite with various N content were fabricated under various reactive sputtering conditions. The magnetic moment of (α ‘+α’)‐Fe16N2 films is discussed in connection with the change of the unit‐cell volume of the bct structure and the degree of N site ordering in nitrogen‐martensite. As a result, it is found that (1) the same structure as bulk α ‘‐Fe16N2 is realized in the present films, (2) the saturation magnetization σs of the α’ phase increases about 4% with increasing unit‐cell volume of the α’ phase, (3) the degree of N site ordering from α’ to α ‘‐Fe16N2 does not much affect σs, and (4) the experimentally obtained maximum value of σs for the (α ‘+α’)‐Fe16N2 film was 232 emu/g. The intrinsic value of σs in the α ‘ phase (in the perfectly ordered state) is proposed to be no more than 240 emu/g at 300 K.