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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Temperature gradient-induced magnetization reversal of single ferromagnetic nanowires
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Temperature gradient-induced magnetization reversal of single ferromagnetic nanowires

机译:温度梯度诱导的单铁磁纳米线磁化反转

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摘要

In this study, we investigate the temperature- and temperature gradient-dependent magnetization reversal process of individual, single-domain Co39Ni61 and Fe15Ni85 ferromagnetic nanowires via the magneto-optical Kerr effect and magnetoresistance measurements. While the coercive fields (H-C) and therefore the magnetic switching fields (H-SW) generally decrease under isothermal conditions at elevated base temperatures (T-base), temperature gradients (Delta T) along the nanowires lead to an increased switching field of up to 15% for Delta T = 300 K in Co39Ni61 nanowires. This enhancement is attributed to a stress-induced, magneto-elastic anisotropy term due to an applied temperature gradient along the nanowire that counteracts the thermally assisted magnetization reversal process. Our results demonstrate that a careful distinction between locally elevated temperatures and temperature gradients has to be made in future heat-assisted magnetic recording devices.
机译:在该研究中,我们研究了通过磁光克尔效应和磁阻测量的个体,单结构域CO39NI61和Fe15Ni85铁磁纳米线的温度和温度梯度依赖性磁化反转过程。 虽然矫顽磁场(HC)和因此磁性开关场(H-SW)在升高的基极温度(T碱)下的等温条件下通常降低,但沿纳米线的温度梯度(ΔT)导致增加的开关场 在CO39NI61纳米线中δT= 300k的15%。 由于沿纳米线的施加温度梯度抵消了热辅助磁化反转过程,这种增强归因于应力诱导的磁弹性各向异性术语。 我们的结果表明,在未来的热辅助磁记录装置中必须仔细区分局部升高的温度和温度梯度。

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