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arXiv 0710.0836cond-mat.str-elcond-mat.dis-nn
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纳米颗粒磁体的巨磁电阻效应

Giant Magnetoresistance in Nanogranular Magnets

A. Glatz, I. S. Beloborodov, V. M. Vinokur

摘要:

我们研究了纳米颗粒磁体在外加磁场和有限温度下的巨磁电阻效应。我们表明,纳米颗粒磁体阵列的磁化在低温下具有滞后行为,导致在高温下合并成一个单峰的磁阻双峰。我们数值计算的磁畴的磁化强度和畴壁的运动在这个系统中使用的组合平均场方法和模型的弹性膜在随机介质中移动,分别。从所得到的结果,我们计算的电阻率作为磁场和温度的函数。我们的研究结果与各种实验数据显示出良好的协议。

英文摘要:

We study the giant magnetoresistance of nanogranular magnets in the presence of an external magnetic field and finite temperature. We show that the magnetization of arrays of nanogranular magnets has hysteretic behaviour at low temperatures leading to a double peak in the magnetoresistance which coalesces at high temperatures into a single peak. We numerically calculate the magnetization of magnetic domains and the motion of domain walls in this system using a combined mean-field approach and a model for an elastic membrane moving in a random medium, respectively. From the obtained results, we calculate the electric resistivity as a function of magnetic field and temperature. Our findings show excellent agreement with various experimental data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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