Magnonic Casimir Effect in Ferrimagnets
Magnonic Casimir Effect in Ferrimagnets
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亚铁磁体中的磁力卡西米尔效应
DOI：
10.1103/physrevlett.130.096702
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Kouki Nakata and Kei Suzuki
中科院分区：
文献类型：
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作者：
小野寺伶耶;佐藤和輝;山崎大誠， 小林拓矢，加藤優樹，綱川仁志， 佐藤一彦，谷口弘三，河本充司;T. Nomura;芝田悟朗，毛司辰，池田啓祐，和達大樹，齋藤智彦，片山司， 長谷川哲也，藤森淳;Kouki Nakata and Kei Suzuki
量子涨落是量子力学的核心概念。在空间边界条件下，量子场的量子涨落会引起能量零点的移动。这种被称为卡西米尔效应的量子现象已经引起了能量尺度层次之外的广泛关注，从基本粒子物理学到凝聚态物理学以及光子学。然而，卡西米尔效应在自旋电子学中的应用还没有得到足够的研究，特别是亚铁磁薄膜，尽管钇铁石榴石（YIG）是自旋电子学的最佳平台之一。我们在这里填补这个空白。利用晶格场理论研究了绝缘磁体中磁振子的量子场诱导的Casimir效应，发现磁振子Casimir效应不仅可以在反铁磁体中产生，也可以在亚铁磁体中产生，包括YIG薄膜。我们的研究结果表明，YIG，基于磁振子的自旋电子学的关键成分，也可以作为一个有前途的平台，操纵和利用卡西米尔效应，称为卡西米尔工程。微加工技术可以控制薄膜的厚度，实现磁振子Casimir效应的操控。因此，我们铺平了道路的磁卡西米尔工程。
Quantum fluctuations are the key concepts of quantum mechanics. Quantum fluctuations of quantum fields induce a zero-point energy shift under spatial boundary conditions. This quantum phenomenon, called the Casimir effect, has been attracting much attention beyond the hierarchy of energy scales, ranging from elementary particle physics to condensed matter physics together with photonics. However, the application of the Casimir effect to spintronics has not yet been investigated enough, particularly to ferrimagnetic thin films, although yttrium iron garnet (YIG) is one of the best platforms for spintronics. Here we fill this gap. Using the lattice field theory, we investigate the Casimir effect induced by quantum fields for magnons in insulating magnets and find that the magnonic Casimir effect can arise not only in antiferromagnets but also in ferrimagnets including YIG thin films. Our result suggests that YIG, the key ingredient of magnon-based spintronics, can serve also as a promising platform for manipulating and utilizing Casimir effects, called Casimir engineering. Microfabrication technology can control the thickness of thin films and realize the manipulation of the magnonic Casimir effect. Thus, we pave the way for magnonic Casimir engineering.