Magnetization reversal and wall propagation velocity in single-crystalline and polycrystalline Fe wires
Magnetization reversal and wall propagation velocity in single-crystalline and polycrystalline Fe wires
复制标题
单晶和多晶铁丝的磁化反转和壁传播速度
DOI：
10.1103/physrevb.81.224425
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发表时间：
2010
影响因子：
3.7
通讯作者：
H. Miyajima
中科院分区：
文献类型：
--
作者：
Y. Kasatani;A. Yamaguchi;H. Yamamoto;H. Miyajima
利用巨磁电阻效应测量了多晶和单晶金属丝层中磁畴壁的传播速度。在单晶Fe线中，DW传播速度（在77 K下110 Oe场中为1 km/s）比多晶Fe线中的传播速度快约三倍。这是由于来自非相干旋转的磁化，这减少了DW的多晶线的流动性的有效阻尼的增加。磁晶各向异性在DW形核和开关过程中起着重要的作用。DW的运动的解析解已被发现的基础上提出的近似Slonczewski-Walker和贝克尔-Döring模型;这些解决方案可以解释我们的实验结果。
The propagation velocities of a magnetic domain wall (DW) in polycrystalline and single-crystalline layers ofwires were measured using the giant magnetoresistance effect. In a single-crystalline Fe wire, the DW propagation velocity (1 km/s in a 110 Oe field at 77 K) was about three times faster than that in a polycrystalline Fe wire. This is attributable to the increase in an effective damping derived from incoherent rotation of the magnetization, which reduced the DW’s mobility in the polycrystalline wire. Magnetocrystalline anisotropy plays an important role in the nucleation of DW and the switching process. Analytic solutions for the DW’s motion have been found on the basis of an approximation suggested by the Slonczewski-Walker and Becker-Döring models; these solutions can explain our experimental results.