Magnetic properties of compounds R2Fe14B
Magnetic properties of compounds R2Fe14B
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DOI：
10.1063/1.334635
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发表时间：
1985-04
影响因子：
3.2
通讯作者：
C. Abache;H. Oesterreicher
中科院分区：
文献类型：
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作者：
C. Abache;H. Oesterreicher
Nd2Fe14B 中自旋重新取向发生在 Ts= 150 K 左右。我们提供了 (Nd1−xRx)2Fe14B 和 Nd2Fe14−xAxB 系统中自旋重新取向趋势的数据，其中 R=不同的稀土元素，A=Co、Al。 Ts 对其中一些取代的不敏感似乎表明 Nd 单独负责转变。我们讨论了一个模型，根据该模型，这种转变可能主要由两个 Nd 位点的各向异性之间的竞争触发。根据晶体场分析，Nd 4f 位点应该更容易受到平面偏好的影响，而 Nd 4g 位点应该具有轴向各向异性。在较低温度下，4f 位点变得相对重要并触发自旋重新定向。然而，类似系统中缺乏类似的自旋重新定向表明情况很复杂。
A spin reorientation occurs in Nd2Fe14B starting around Ts= 150 K. We present data on tendencies in spin reorientations in systems (Nd1−xRx)2Fe14B and Nd2Fe14−xAxB where R=different rare earths and A=Co, Al. The insensitivity of Ts to some of these substitutions appears to indicate that Nd alone is responsible for the transition. We discuss a model according to which this transition may be triggered primarily by a competition amongst the anisotropies of the two Nd sites. According to a crystal field analysis the Nd 4f site should be more susceptible to plane preference while the Nd 4g site should have axial anisotropy. At lower temperatures the 4f site gains in relative importance and triggers the spin reorientation. The absence of a similar spin reorientation in analogous systems however indicates a complex situation.