Control of magnetic ordering of nanoscale metal and nanoparticle assembly by magnetoelectric effect

2014 Fiscal Year Final Research Report

• Project/Area Number: 24310093
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Nanomaterials/Nanobioscience
• Research Institution: Keio University
• Principal Investigator: SATO Tetsuya 慶應義塾大学, 理工学部, 教授 (20162448)
• Co-Investigator(Kenkyū-buntansha): FUJIHARA Shinobu 慶應義塾大学, 理工学部, 教授 (60276417) ; MAKI Hideyuki 慶應義塾大学, 理工学部, 准教授 (10339715)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 電気磁気効果 / 磁気秩序制御 / 磁気異方性制御 / 超薄膜 / 量子井戸 / 位相散乱シフト / 強磁性ナノ粒子集合体 / 磁気相互作用制御

Outline of Final Research Achievements

Control method of ferromagnetic state with large spontaneous magnetization using the magnetoelectric effect is studied from two points of view. First, the magnetic control is performed by changing the Fermi energy of exchange-enhanced metal using electric field at a boundary of Stoner criterion for appearance of ferromagnetism. In this method, nanoparticle and ultra thin film of Pd are used. Next, the ferromagnetic nanoparticle assembly with strong magnetic interaction is magnetically controlled through the change in the ratio of magnetic interaction and magnetic anisotropy by changing the magnetic anisotropy energy of nanoparticle by electric field. In this method, assembly of pure Fe nanoparticles is used. Based on this, much knowledge about method for controlling magnetic ordering of nanoparticle/ultra thin film and ferromagnetic nanoparticle assembly, which becomes a basis of the development of magnetic application technology in the field of spintronics, was obtained.

Free Research Field

磁気物性工学