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Temperature dependence of the magnetization reversal process in patterned Ni nanowires

机译：图案化镍纳米线中磁化反转过程的温度依赖性

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The magnetic behaviour of patterned Ni wires has been studied by magnetotransport measurements to analyse the mechanisms that govern the magnetization reversal in these ordered nanostructures as a function of temperature in the 150-350 K range. These results show reversal processes driven by a temperature-dependent combination of two different mechanisms: coherent rotation and a curling-like irreversible process. When the field is decreased from saturation the magnetization rotates reversibly until it reaches the nanowires' direction where it reverses its sign by an irreversible process at low fields. The amplitude in the magnetoresistance of this irreversible process is reduced as the temperature is increased, with a sharp step at room temperature. In fact, the analysis of the angular dependence reveals that it is compatible with an incoherent curling process up to 300 K in the whole angular range. For higher temperatures, a crossover towards coherent rotation is observed in the irreversible contribution for high angles between the applied field and the wire direction.
机译：已通过磁传输测量研究了图案化Ni线的磁行为，以分析控制这些有序纳米结构中磁化反转与温度在150-350 K范围内的关系的机制。这些结果表明，逆转过程是由两种不同机制的温度相关组合驱动的：相干旋转和类似卷发的不可逆过程。当磁场从饱和状态减小时，磁化强度将可逆地旋转，直到达到纳米线的方向为止，在纳米线的方向上，磁化强度在低磁场下通过不可逆过程反转其符号。随着温度的升高，这种不可逆过程的磁阻幅度减小，在室温下急剧上升。实际上，对角度依赖性的分析表明，它与整个角度范围内最大300 K的非相干卷曲过程兼容。对于较高的温度，对于施加的磁场和导线方向之间的高角度，观察到朝着相干旋转的交叉，这是不可逆的作用。

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