The peculiarities of magnetization reversal process in magnetic nanotube with helical anisotropy
The peculiarities of magnetization reversal process in magnetic nanotube with helical anisotropy
复制标题
螺旋各向异性磁性纳米管磁化反转过程的特点
DOI：
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复制
发表时间：
2014
期刊：
影响因子：
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通讯作者：
O. Serebryakova
中科院分区：
文献类型：
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作者：
N. Usov;O. Serebryakova
采用数值模拟的方法研究了弱螺旋磁各向异性软磁纳米管的磁化反转过程。螺旋各向异性的起源是对磁弹性能量密度的小的非对角修正。示出平行于纳米管轴的外部磁场的变化，以启动与纳米管的圆形磁化分量的跳跃在临界磁场H s的磁滞。对于均匀的纳米管，临界磁场H s作为纳米管的几何参数和磁性参数的函数进行了研究。利用二维微磁学模拟，我们研究了在其中间部分具有磁性缺陷的纳米管的行为。在这种情况下，圆形磁化分量的跳跃在缺陷处开始。其结果是，两个竹畴壁出现附近的缺陷和传播到纳米管的两端。类似的效应可以解释在磁化反转过程中，具有负磁致伸缩的略微不均匀的非晶铁磁微丝中出现的竹畴壁。
The magnetization reversal process in a soft magnetic nanotube with a weak helical magnetic anisotropy is studied by means of numerical simulation. The origin of a helical anisotropy is a small off-diagonal correction to the magneto-elastic energy density. The change of the external magnetic field parallel to the nanotube axis is shown to initiate a magnetic hysteresis associated with the jumps of the circular magnetization component of the nanotube at a critical magnetic field H s. For a uniform nanotube, the critical magnetic field H s is investigated as a function of geometrical and magnetic parameters of the nanotube. Using 2D micromagnetic simulation, we study the behavior of a nanotube having magnetic defects in its middle part. In this case, the jump of the circular magnetization component starts at the defect. As a result, two bamboo domain walls appear near the defect and propagate to the nanotube ends. Similar effect may explain the appearance of the bamboo domain walls in a slightly non uniform amorphous ferromagnetic microwire with negative magnetostriction during magnetization reversal process.
影响因子：
4
作者：
Boehnert, Tim;Vega, Victor;Nielsch, Kornelius
通讯作者：
Nielsch, Kornelius