Nonlinear magneto-electric effect in artificial magnetic domain wall

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H03966
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Electronic materials/Electric materials
• Research Institution: University of Tsukuba
• Principal Investigator: YANAGIHARA Hideto 筑波大学, 数理物質系, 教授 (50302386)
• Co-Investigator(Renkei-kenkyūsha): KITA EIJI 筑波大学, 数理物質系, 特任教授 (80134203)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 非線形電気磁気効果 / スピネルフェライト / スピントロニクス

Outline of Final Research Achievements

Magneto-electric effect (ME) is phenomena coupling between the magnetic and electric properties in materials. The ME effect is one of the promising candidate to reverse the magnetization by electric field. In this research, we focus on a ME mechanism for a spiral spin structure which generates electric polarization of P∝ eij× ( Si × Sj) . By combining the two insulating ferromagnetic thin films with different magnetic preferential directions, an artificial 90-degree magnetic domain wall emerges at the interface of the two films, which can be expected to generate electric polarization. Since the induced electric polarity is simply dependent on the chirality of magnetic domain wall, the magnetization can be controlled by external electric field. We fabricated a bilayer system composed of two ferromagnetic insulators with different magnetic preferential directions and verified the ME effect in the bilayer system.

Free Research Field

磁性薄膜