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Magnetoresistance of rolled-up Fe _3Si nanomembranes

机译：上卷Fe _3Si纳米膜的磁阻

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Magnetotransport of individual rolled-up Fe _3Si nanomembranes is investigated in a broad temperature range from 4.2 K up to 300 K in pulsed magnetic fields up to 55T. The observed magnetoresistance (MR) has the following pronounced features: (i) MR is negative in the investigated intervals of temperature and magnetic field; (ii) its magnitude increases linearly with the magnetic field in a low-field region and reveals a gradual trend to saturation when the magnetic field increases; (iii) the MR effect becomes more pronounced with increasing temperature. These dependences of MR on the magnetic field and temperature are in line with predictions of the spin-disorder model of the spin-flip sd interaction assisted with creation or annihilation of magnons, which is expected above a certain critical temperature. Comparison of the MR features in rolled-up and planar samples reveals a substantial increase of the critical temperature in the rolled-up tube, which is attributed to a new geometry and internal strain arising in the rolled-up nanomembranes, influencing the electronic and magnetic properties of the material.
机译：在高达55T的脉冲磁场中，在4.2 K至300 K的较宽温度范围内研究了单个卷起的Fe _3Si纳米膜的磁传输。观察到的磁阻（MR）具有以下明显特征：（i）在研究的温度和磁场间隔中MR为负; （ii）其强度随磁场在低场区域的增加而线性增加，并随着磁场的增加而逐渐趋于饱和; （iii）随着温度升高，MR效应变得更加明显。 MR对磁场和温度的这些依赖性与自发-翻转sd相互作用的自旋无序模型的预测相一致，该模型在一定的临界温度以上有望协助产生或消灭磁振子。比较卷状样品和平面样品中的MR特征，可以发现卷状管中的临界温度大幅提高，这是由于卷状纳米膜中出现了新的几何形状和内部应变，从而影响了电子和磁性材料的特性。

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