Ferromagnetic Resonance of a Single Magnetochiral Metamolecule of Permalloy

被引:6
作者
Kodama, Toshiyuki [1 ]
Tomita, Satoshi [1 ]
Kato, Takeshi [2 ]
Oshima, Daiki [3 ]
Iwata, Satoshi [3 ]
Okamoto, Satoshi [4 ]
Kikuchi, Nobuaki [4 ]
Kitakami, Osamu [4 ]
Hosoito, Nobuyoshi [1 ]
Yanagi, Hisao [1 ]
机构
[1] Nara Inst Sci & Technol, Grad Sch Mat Sci, Nara 6300192, Japan
[2] Nagoya Univ, Grad Sch Engn, Chikusa Ku, Nagoya, Aichi 4648603, Japan
[3] Nagoya Univ, Inst Mat & Syst Sustainabil, Chikusa Ku, Nagoya, Aichi 4648603, Japan
[4] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan
来源
PHYSICAL REVIEW APPLIED | 2016年 / 6卷 / 02期
关键词
CHIRAL DICHROISM; THIN-FILMS; BIREFRINGENCE; EXCITATIONS; FIELD;
D O I
10.1103/PhysRevApplied.6.024016
中图分类号
O59 [应用物理学];
学科分类号
摘要
We investigate the ferromagnetic resonance (FMR) of a single chiral structure of a ferromagnetic metal-the magnetochiral (MCh) metamolecule. Using a strain-driven self-coiling technique, micrometer-sized MCh metamolecules of metallic permalloy (Py) are fabricated without any residual Py films. The magnetization curves of ten Py MCh metamolecules obtained by an alternating gradient magnetometer show soft magnetic behavior. In cavity FMR with a magnetic-field sweep and coplanar-waveguide (CPW) FMR with a frequency sweep, the Kittel-mode FMR of the single Py metamolecule is observed. The CPW-FMR results, which are consistent with the cavity-FMR results, bring about the effective g factor, effective magnetization, and Gilbert damping of the single metamolecule. Together with calculations using these parameters, the angle-resolved cavity FMR reveals that the magnetization in the Py MCh metamolecule is most likely to be the hollow-bar type of configuration when the external magnetic field is applied parallel to the chiral axis, although the expected magnetization state at remanence is the corkscrew type of configuration.
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页数:9
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