High pressure effects on isotropic Nd2Fe14B magnet accompanying change in coercive field
High pressure effects on isotropic Nd2Fe14B magnet accompanying change in coercive field
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DOI：
10.1063/1.4932599
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发表时间：
2015-10
影响因子：
3.2
通讯作者：
M. Mito;H. Goto;K. Nagai;K. Tsuruta;H. Deguchi;T. Tajiri;K. Konishi
中科院分区：
文献类型：
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作者：
M. Mito;H. Goto;K. Nagai;K. Tsuruta;H. Deguchi;T. Tajiri;K. Konishi
我们研究了静水压力对由纳米晶组成的各向同性Nd2Fe14B磁体(准确的化学式为Nd2.0Fe14.1B)的影响，该磁体由尺寸约为30 nm的纳米晶体组成，在高达9.3 GPa时的磁化测量和高达4.3 GPa时的结构分析。用空间均匀磁化的钛合金制成的微型金刚石压腔测量了磁化曲线。300K时的矫顽场Hc的初值为840kA/m(=10.6Koe)，Hc的初始值随压力几乎呈线性增加，约为1180kA/m(=15.0Koe)。然而，HC的增加在P=3 GPa时饱和。Hc的变化可以通过在单区相各向异性恒定的框架内饱和磁化强度ms的减小来理解。当P<；1 Gpa时，结晶应变增加。随后，随着压力的增加，晶粒度(D)开始减小，并且在高于约3 GPa时减小趋于饱和。毛皮..。
We investigated the effects of hydrostatic pressure on an isotropic Nd2Fe14B magnet (the exact chemical formula is Nd2.0Fe14.1B) consisting of nanocrystals, with the size of approximately 30 nm, by magnetization measurements at pressures (P's) up to 9.3 GPa and structural analyses up to 4.3 GPa. Magnetization curves were measured by using a miniature diamond anvil cell made of Ti alloy with spatially uniform magnetization. The initial value of coercive field Hc at 300 K is 840 kA/m (=10.6 kOe), and Hc initially increases to approximately 1180 kA/m (=15.0 kOe) almost linearly against the pressure. The increase in Hc, however, saturates at around P = 3 GPa. The change in Hc is understood by the decrease in the saturation magnetization Ms within the framework of the constant anisotropy of the single domain phase. The crystalline strain increases for P < 1 GPa. Afterward, the crystalline size (D) starts to decrease with increasing pressure, and the reduction tends to saturate at above approximately 3 GPa. Fur...