Controlling the magnetoimpedance property of thin-film elements using Joule heating
Controlling the magnetoimpedance property of thin-film elements using Joule heating
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使用焦耳热控制薄膜元件的磁阻抗特性
DOI：
10.1109/tmag.2022.3151985
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发表时间：
2022
影响因子：
2.1
通讯作者：
M. Tanii
中科院分区：
文献类型：
--
作者：
H. Kikuchi;A. Ueno;M. Tanii
优化磁阻抗 (MI) 的性能需要控制材料的各向异性，这通常通过场退火来完成。然而，场退火需要真空环境的大型设备，并且消耗大量的电力用于加热和产生大的磁场。相反，焦耳加热具有简单、紧凑、可以使用小电流的优点。因此，我们尝试使用焦耳加热和磁铁施加的磁场来控制薄膜 MI 元件的磁各向异性。在退火之前，由于形状各向异性，元件具有方向平行于元件纵向的易磁化轴。焦耳加热后，MI行为表现出双峰曲线，这是获得大阻抗变化时的典型阻抗曲线。阻抗和电感的峰值高度随着加热电流增加到100 mA，然后变得恒定或稍微增加。阻抗和电感具有峰值的场随着热电流的增加而单调增加。我们通过使用克尔效应显微镜观察磁畴结构，确认磁各向异性方向随着焦耳加热和磁体施加的磁场而变化。
Optimizing the performance of magnetoimpedance (MI) requires controlling the anisotropy of material which is often done with field annealing. However, field annealing needs large-scale equipment with a vacuum environment and consumes a large amount of electricity for heating and generating a large magnetic field. Conversely, Joule heating has advantages of simple, compact, and possible-to-use small current. Thus, we attempted controlling the magnetic anisotropy on thin-film MI elements using Joule heating and the applied field by magnets. Before annealing, the element has an easy axis with a direction parallel to the longitudinal direction of the element owing to shape anisotropy. After Joule heating, the MI behavior showed a double peak profile, which is a typical impedance profile when large impedance changes are obtained. The peak height in the impedance and inductance increases with the heating current up to 100 mA and then becomes constant or slightly increases. The field at which the impedance and inductance have a peak increases monotonically with increasing heat current. We confirm that the magnetic anisotropy direction changes with Joule heating and with a field applied by magnets based on observing the magnetic domain structure using a Kerr effect microscope.