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交换耦合铁氧体/铁磁异质结构的微磁模拟

Micromagnetic simulation of exchange coupled ferri-/ferromagnetic heterostructures.

作者信息

Oezelt Harald, Kovacs Alexander, Reichel Franz, Fischbacher Johann, Bance Simon, Gusenbauer Markus, Schubert Christian, Albrecht Manfred, Schrefl Thomas

机构信息

Industrial Simulation, St. Pölten University of Applied Sciences, Matthias Corvinus-Straße 15, A-3100 St. Pölten, Austria.

Center for Integrated Sensor Systems, Danube University Krems, Viktor Kaplan-Straße 2, A-2700 Wiener Neustadt, Austria.

出版信息

J Magn Magn Mater. 2015 May 1;381:28-33. doi: 10.1016/j.jmmm.2014.12.045.

DOI:10.1016/j.jmmm.2014.12.045
PMID:25937693
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4394145/
Abstract

Exchange coupled ferri-/ferromagnetic heterostructures are a possible material composition for future magnetic storage and sensor applications. In order to understand the driving mechanisms in the demagnetization process, we perform micromagnetic simulations by employing the Landau-Lifshitz-Gilbert equation. The magnetization reversal is dominated by pinning events within the amorphous ferrimagnetic layer and at the interface between the ferrimagnetic and the ferromagnetic layer. The shape of the computed magnetization reversal loop corresponds well with experimental data, if a spatial variation of the exchange coupling across the ferri-/ferromagnetic interface is assumed.

摘要

交换耦合铁磁/铁磁异质结构是未来磁存储和传感器应用中一种可能的材料组成。为了理解退磁过程中的驱动机制，我们采用朗道-里夫希茨-吉尔伯特方程进行微磁模拟。磁化反转主要由非晶亚铁磁层内以及亚铁磁层与铁磁层界面处的钉扎事件主导。如果假设交换耦合在铁磁/铁磁界面上存在空间变化，那么计算得到的磁化反转回线形状与实验数据吻合得很好。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/59aa/4394145/bdeebfd79ef1/gr7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/59aa/4394145/0a7214fdce08/gr1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/59aa/4394145/51be4b75dd46/gr2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/59aa/4394145/3705c7e6ec30/gr3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/59aa/4394145/6993f7b5b22c/gr4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/59aa/4394145/2dbe8688a332/gr5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/59aa/4394145/0becc6777b07/gr6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/59aa/4394145/bdeebfd79ef1/gr7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/59aa/4394145/0a7214fdce08/gr1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/59aa/4394145/51be4b75dd46/gr2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/59aa/4394145/3705c7e6ec30/gr3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/59aa/4394145/6993f7b5b22c/gr4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/59aa/4394145/2dbe8688a332/gr5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/59aa/4394145/0becc6777b07/gr6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/59aa/4394145/bdeebfd79ef1/gr7.jpg

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Nature. 2005 Jun 2;435(7042):655-7. doi: 10.1038/nature03564. Epub 2005 May 25.