Terahertz permeability of FePt nanowire

Submit Time: 2021-12-14

Author: Han, Mangui 1 ; Meng, Sen 1 ;

Institute: 1.School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu;

Abstracts

与单根Fe纳米线的GHz磁导率相比较，我们对具有L10型晶体结构的FePt纳米线在处于剩余磁化状态下（Mr/Ms=1.0）的太赫兹磁导率进行了微磁学仿真。由于FePt纳米线具有很强的磁晶各向异性场，我们的研究表明它可以在0.348THz下具有很强的太赫兹磁导率，这曾被认为只能通过人工超材料才能获得。L10-FePt纳米线的THz磁谱明显不同于Fe纳米线GHz下的磁谱，它存在不同寻常的负数磁导率虚部(u"<0)，我们认为这与它不寻常自然共振下的旋进过程所导致的等效负数阻尼系数相关。

[英文摘要] Compared to the gigahertz (GHz) permeability of single Fe nanowire, terahertz (THz) permeability of single L10-FePt nanowire at its remanent state (Mr/Ms =1.0) has been simulated by micromagnetics. Due to its very large magnetocrystalline anisotropic field, it is feasible to obtain strong THz permeability at 0.348 THz , which are ever thought only possible in some metamaterials. The THz permeability spectra of L10-FePt are shown obviously different from those of Fe nanowire at gigahertz (GHz). Unusual negative imaginary parts of permeability (u"<0) is found related to the equivalent negative damping constant, which is explained from the perspective of abnormal precession of natural resonance at THz for FePt nanowire .

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From: 韩满贵

Subject: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

DOI：10.12074/202112.00084

Keywords: 太赫兹磁导率; FePt纳米线; 自然共振; 微磁学;

Cite as: chinaXiv:202112.00084 (or this versionchinaXiv:202112.00084V1)

Recommended references： Han, Mangui,Meng, Sen .(2021).THz permeability of FePt nanowire.[ChinaXiv:202112.00084] (Click&Copy)

Version History
[V1]	2021-12-14 14:00:26	chinaXiv:202112.00084V1	Download

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Terahertz permeability of FePt nanowire

Abstracts

1. Large-scale ultra-fast strain engineering of CVD-grown two-dimensional materials on strain self-limited deformable nanostructures towards enhanced field effect transistors 2022-04-30

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