Ferromagnetic Resonance of a Single Magnetochiral Metamolecule of Permalloy

作     者：Toshiyuki Kodama Satoshi Tomita Takeshi Kato Daiki Oshima Satoshi Iwata Satoshi Okamoto Nobuaki Kikuchi Osamu Kitakami Nobuyoshi Hosoito Hisao Yanagi 

作者机构：Graduate School of Materials Science Nara Institute of Science and Technology Ikoma Nara 630-0192 Japan Graduate School of Engineering Nagoya University Chikusa Nagoya 464-8603 Japan Institute of Materials and Systems for Sustainability Nagoya University Chikusa Nagoya 464-8603 Japan Institute of Multidisciplinary Research for Advanced Materials Tohoku University Katahira Sendai 980-8577 Japan 

出 版 物：《Physical Review Applied》 (Phys. Rev. Appl.)

年 卷 期：2016年第6卷第2期

页      面：024016-024016页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：Japan Society for the Promotion of Science, JSPS, (15J07126, 26287065, 26289102) Ministry of Education, Culture, Sports, Science and Technology, MEXT Tohoku University 

主　　题：Strain Metamaterials Permalloy Ferromagnetic resonance Magnetization measurements 

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.