Ferromagnetic semiconductors codoped with donors and their devices

2014 Fiscal Year Final Research Report

• Project/Area Number: 26600068
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Applied materials
• Research Institution: Tohoku University
• Principal Investigator: MATSUKURA Fumihiro 東北大学, 原子分子材料科学高等研究機構, 教授 (50261574)
• Project Period (FY): 2014-04-01 – 2015-03-31
• Keywords: スピントロニクス / 強磁性半導体 / 分子線エピタキシ / 同時ドーピング / 磁気異方性

Outline of Final Research Achievements

We grow (Ga,Mn)As codoped with nonmagnetic Li donors by molecular beam epitaxy. We show that the solubility of Mn in GaAs is increased by Li doping above 1%. (Ga,Mn)As with Mn composition of 15% and Li composition of 1% shows the magnitude of magnetization of 140 mT, which is the largest value reported so far, and the result indicate that the most of introduced Mn substitute into cation sites. We observe pronounced in-plane magnetic anisotropy, whose direction depends on temperature.

Free Research Field

工学