The fine magnetic structure of magnetic multilayer with 90 degrees magnetic coupling layer by using Polarized Neutron Reflectivity analysis

摘要

Recently antiferromagnetic (AFM) spintronics are drawing attention owing to the high resonance frequencies and zero stray fields. It has been theoretically reported that spin transfer torques (STT) in AFM materials can be obtained. However, it is hard to directly observe spin torque oscillation (STO). Comparing to this, we fabricated the novel quasi-AFM layer which has multiple domains with alternatively antiparallel magnetization by using biquadratic magnetic coupling between two ferromagnetic (FM) layers through Fe-O layer. The magnetic property of the quasi-AFM layer is expected to have properties that are intermediate between AFM and FM. The macroscopic result of its magnetic property is shown in ref., and the crystal structure was also be reported in ref. And to analyze the magnetic structure, we carried out polarized neutron reflectivity (PNR) analysis by BL17 SHARAKU in MLF, J-PARC.