Development of the electric-field controlled magneto-optical effect

2016 Fiscal Year Final Research Report

• Project/Area Number: 26709046
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Physical properties of metals/Metal-base materials
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: NOZAKI TAKAYUKI 国立研究開発法人産業技術総合研究所, スピントロニクス研究センター, 研究チーム長 (60452405)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: スピントロニクス / 磁気光学効果 / 電圧制御

Outline of Final Research Achievements

This project aimed to develop the technique of electric-field control of magneto-optical effect in a ferromagnetic metal layer. We prepared junction structure by the combination of pulse laser deposition for dielectric materials and molecular beam epitaxy or sputtering techniques for metal materials. We found that SrHfO3 can exhibit a relatively high dielectric constant of about 25 with low leak current, which is suitable for voltage-controlled devices. In the device with FeB ferromagnetic layer, we realized the modification of Kerr rotation angle of 0.03 degree, which corresponds to about 60 fJ/Vm as the voltage-induced anisotropy change. We also found that Pt doping at the Fe/MgO interface is effective to enhance the voltage effect as well as the interface magnetic anisotropy. By combining the developed technique, highly-efficient electric-field control of magneto-optical effects can be expected.

Free Research Field

スピントロニクス