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合成反铁磁体中的快速无势垒切换。

Fast barrier-free switching in synthetic antiferromagnets.

作者信息

Dzhezherya Yu, Kalita V, Polynchuk P, Kravets A, Korenivski V, Kruchinin S, Bellucci S

机构信息

Institute of Magnetism, NASU and MESU, Kyiv, 03142, Ukraine.

National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv, 03056, Ukraine.

出版信息

Sci Rep. 2025 Jan 6;15(1):931. doi: 10.1038/s41598-024-67287-0.

DOI:10.1038/s41598-024-67287-0
PMID:39762242
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11704216/
Abstract

We analytically solve the Landau-Lifshitz equations for the collective magnetization dynamics in a synthetic antiferromagnet (SAF) nanoparticle and uncover a regime of barrier-free switching under a short small-amplitude magnetic field pulse applied perpendicular to the SAF plane. We give examples of specific implementations for forming such low-power and ultra-fast switching pulses. For fully optical, resonant, barrier-free SAF switching we estimate the power per write operation to be  pJ, 10-100 times smaller than for conventional quasi-static rotation, which should be attractive for memory applications.

摘要

我们通过解析求解朗道-栗弗席兹方程，研究了合成反铁磁（SAF）纳米颗粒中的集体磁化动力学，并发现了在垂直于SAF平面施加的短小幅度磁场脉冲下无势垒切换的机制。我们给出了形成这种低功耗和超快速切换脉冲的具体实现示例。对于全光、共振、无势垒的SAF切换，我们估计每次写入操作的功率为皮焦耳，比传统准静态旋转小10 - 100倍，这对于存储器应用应该具有吸引力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1cc1/11704216/1d34cbb06bd1/41598_2024_67287_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1cc1/11704216/e68791b635df/41598_2024_67287_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1cc1/11704216/c030876d6100/41598_2024_67287_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1cc1/11704216/f15cdb06b1ac/41598_2024_67287_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1cc1/11704216/1d34cbb06bd1/41598_2024_67287_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1cc1/11704216/e68791b635df/41598_2024_67287_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1cc1/11704216/c030876d6100/41598_2024_67287_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1cc1/11704216/f15cdb06b1ac/41598_2024_67287_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1cc1/11704216/1d34cbb06bd1/41598_2024_67287_Fig4_HTML.jpg

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