Coercivity Mechanism of Ga-doped Nd-Fe-B Sintered Magnets
Coercivity Mechanism of Ga-doped Nd-Fe-B Sintered Magnets
复制标题
Ga掺杂Nd-Fe-B烧结磁体的矫顽力机理
DOI：
10.1109/tmag.2019.2940205
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
and Kozo Osamura
中科院分区：
文献类型：
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作者：
Yutaka Matsuura;Tetsuya Nakamura;Keisuke Ishigami;Kentaro Kajiwara;Kazushi Sumitani;Ryuji Tamura;Masahiro Nagae;and Kozo Osamura
分析了取向和各向同性取向掺Ga的Nd14.79Ga0.57B5，24Co1.11Febal烧结磁体的取向依赖性和角度依赖性（分别为ALDC和ANDC），并与我们以前报道的铁氧体磁体的结果进行了比较。Ga掺杂Nd-Fe-B磁体的矫顽力随取向度的提高而降低。该磁体的ALDC与铁氧体磁体的ALDC相似。取向Ga掺杂磁体的磁化反转区（AMRA）的角度在磁化率下具有41.4°的角倾斜，这比铁氧体磁体的角倾斜更宽。Ga掺杂Nd-Fe-B烧结磁体的ANDC表现出与铁氧体磁体相似的行为，但略低于铁氧体磁体，这是从Ga掺杂Nd-Fe-B烧结磁体的AMRA中预期的。这些结果支持了我们提出的矫顽磁力机制;具体地说，磁畴壁被钉扎在具有倾斜的易磁化方向或与磁体的易磁化方向倾斜的轴的颗粒处。当磁畴壁从钉扎位点被解除钉扎时，它们跳跃通过几个晶粒，从而确定磁性。
The alignment dependence and angular dependence of coercivity (ALDC and ANDC, respectively) of aligned and isotropically aligned Ga-doped Nd14.79Ga0.57B5,24Co1.11Febal sintered magnets were analyzed, and the results were compared with those of ferrite magnets, which were reported in our previous paper. The coercivity of Ga-doped Nd-Fe-B magnets decreases as alignment improves. The ALDC of this magnet is similar to that of ferrite magnets. The angle of the magnetization-reversal area (AMRA) of the aligned Ga-doped magnets has at coercivity an angular tilt of 41.4°, which is wider than that of the ferrite magnets. The ANDC of Ga-doped Nd-Fe-B sintered magnets displays similar behavior with that of ferrite magnets but is slightly lower than that of ferrite magnets, which is expected from AMRA of Ga-doped Nd-Fe-B sintered magnets. These results support our proposed coercivity mechanism; specifically, the magnetic domain walls are pinned at grains with tilted easy magnetization directions or-axis tilted from the easy magnetization of the magnet. When the magnetic domain walls are de-pinned from the pinning sites, they jump through several grains, thereby determining the coercivity.