Electron magnetic resonance in interacting ferromagnetic-metal nanoparticle systems: experiment and numerical simulation

被引：17

作者：

Mitsumata, Chiharu ^{[1
]}

Tomita, Satoshi ^{[2
]}

Hagiwara, Masayuki ^{[3
]}

Akamatsu, Kensuke ^{[4
,5
]}

机构：

[1] Hitachi Met Ltd, Prod Syst Lab, Kumagaya, Saitama 3600843, Japan

[2] Nara Inst Sci & Technol, Grad Sch Mat Sci, Nara 6300192, Japan

[3] Osaka Univ, Ctr Quantum Sci & Technol Extreme Condit, KYOKUGEN, Osaka 5608531, Japan

[4] Konan Univ, FIRST, Chuo Ku, Kobe, Hyogo 6500047, Japan

[5] Japan Sci & Technol Agcy, PRESTO, Chuo Ku, Kobe, Hyogo 6500047, Japan

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2010年 / 22卷 / 01期

关键词：

THIN-FILMS; BEHAVIOR; REFRACTION; INDEX; LENS;

D O I：

10.1088/0953-8984/22/1/016005

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have studied electron magnetic resonance (EMR) in ferromagnetic-metal nanoparticle systems which show promise as a component of left-handed metamaterials. Metallic Ni nanoparticles of about 8 nm in diameter are embedded in polymer films. When the average distance between the nanoparticles is decreased, we observed that the EMR signal shifts and broadens. Theoretical analyses based on micromagnetics simulation confirm that the shift of the signal is traced back to an increase in the magnetic dipole field in the nanoparticle systems due to the decrease in interparticle distance. Moreover, the simulation reveals that the perpendicular component of the dipolar field causes the broadening of the signal. The present study demonstrates that a dynamic analysis of the magnetization, with an explicit treatment of the magnetic dipole interactions, is necessary for a thorough understanding of the EMR and magnetic permeability of interacting nanoparticle systems.

引用

页数：10