非平衡玻尔兹曼方程方法中锥形磁体的巨磁电阻和负磁电阻。

IF 2.3 4区 物理与天体物理 Q3 PHYSICS, CONDENSED MATTER
Raz Rivlis, Andrei Zadorozhnyi, Yuri Dahnovsky
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引用次数: 0

摘要

我们利用非平衡玻尔兹曼方程方法研究了锥形自旋磁体晶体中的磁传输。自旋相关磁阻在不同温度下的高电子浓度和低电子浓度下表现出显著的特性。对于自旋向上的电子,尽管只考虑了单一载流子类型,我们还是发现了负磁电阻。对于自旋向下的电子,我们观察到巨大的磁阻,这是由于自旋向下的电子在外加磁场的作用下耗尽所致。对于自旋向上的载流子,磁阻为负,这是由于电荷载流子在磁场作用下会增加。此外,我们还研究了自旋相关霍尔效应。如果磁场达到自旋向下电子的某个临界值,就会出现巨大的霍尔电阻,即霍尔电流消失。这种效应的原因是没有自旋向下的载流子。对于自旋向上的载流子,由于自旋向上的电子密度增加,霍尔常数随磁场的增加而急剧下降。由于存在与自旋相关的巨大磁阻和霍尔电阻率,锥形自旋磁体可用于自旋切换设备。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Giant and negative magnetoresistances in conical magnets in the nonequilibrium Boltzmann equation approach.

We study magnetotransport in conical helimagnet crystals using the nonequilibriun Boltzmann equation approach. Spin dependent magnetoresistance exhibits dramatic properties for high and low electron concentrations at different temperatures. For spin up electrons we find negative magnetoresistance despite only considering a single carrier type. For spin down electrons we observe giant magnetoresistance due to depletion of spin down electrons with an applied magnetic field. For spin up carriers, the magnetoresistance is negative, due to the increase in charge carriers with a magnetic field. In addition, we investigate the spin dependent Hall effect. If a magnetic field reaches some critical value for spin down electrons, giant Hall resistance occurs, i.e. Hall current vanishes. This effect is explained by the absence of spin down carriers. For spin up carriers, the Hall constant dramatically decreases with field, due to the increase in spin up electron density. Because of the giant spin dependent magnetoresistance and Hall resistivity, conical helimagnets could be useful in spin switching devices.

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来源期刊
Journal of Physics: Condensed Matter
Journal of Physics: Condensed Matter 物理-物理:凝聚态物理
CiteScore
5.30
自引率
7.40%
发文量
1288
审稿时长
2.1 months
期刊介绍: Journal of Physics: Condensed Matter covers the whole of condensed matter physics including soft condensed matter and nanostructures. Papers may report experimental, theoretical and simulation studies. Note that papers must contain fundamental condensed matter science: papers reporting methods of materials preparation or properties of materials without novel condensed matter content will not be accepted.
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