A design of spin polarization analyzer and its application to quasi-excusive OR gate

2014 Fiscal Year Final Research Report

• Project/Area Number: 24656007
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Applied materials science/Crystal engineering
• Research Institution: Saitama University
• Principal Investigator: SAKAI Masamichi 埼玉大学, 理工学研究科, 教授 (40192588)
• Co-Investigator(Kenkyū-buntansha): HASEGAWA Shigehiko 大阪大学, 産業科学研究所, 准教授 (50189528)
• Co-Investigator(Renkei-kenkyūsha): KITAJIMA Akira 大阪大学, 産業科学研究所, 特任助教 (50532248) ; OSHIMA Akihiro 大阪大学, 産業科学研究所, 特任准教授 (80398924)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: スピン軌道相互作用 / スピン偏極 / 排他的論理和ゲート

Outline of Final Research Achievements

We have theoretically and experimentally designed the spin-polarization analyzer making use of the quasi-zero Hall coefficient (QZHC) characteristic in bipolar conductors such as dihydride phase of Y and Sc. We derived the closed formulae of Hall resistivity (HR) and transverse magnetoresisitivity (TMR) in the presence of spin splitting in electrochemical potential (ECP) caused by spin-polarized current injection from ferromagnetic electrodes. Our experiments used Co and/or TbFeCo as source and drain electrodes, from which the spin-polarized currents are injected into the bipolar conductor region. As predicted by our calculation, both HR and TMR are enhanced when these magnetic electrodes are used instead of nonmagnetic Au electrode. The enhancement is caused by the coupling mechanism between applied magnetostatic field and spin-orbit interaction through the spin splitting in the ECP. This feature as well as material choice can be applied to operation of exclusive OR gate.

Free Research Field

磁気伝導物性・スピントロニクス