Study on new magnetostrictive materials using spin state and unusual crystal orientation dependence

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K18262
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Structural/Functional materials
• Research Institution: Ibaraki National College of Technology
• Principal Investigator: SATO Keisuke 茨城工業高等専門学校, 国際創造工学科, 准教授 (10418212)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 磁歪 / コバルト酸化物 / 結晶方位依存性

Outline of Final Research Achievements

The present study investigates crystalline orientation dependence of magnetostriction of twinned rhombohedral perovskite cobalt oxide, La0.8Sr0.2CoO3. The magnetostriction in a magnetic field applied along the pseudo-cubic [111]c and [110]c axes showed large hysteresis and residual strains. On the other hand, hysteresis and residual strain were not observed in the applied magnetic field along the [001]c axis. The large hysteresis and residual strains of the magnetostriction along the [111]c and [110]c axes are successfully interpreted as a rearrangement of the rhombohedral domains with the magnetocrystalline hard axis along the rhombohedral [111]r. In the preliminary analysis, the anisotropy energy was determined as -0.12 MJ/m3, which has the same magnitude as that of Ni2MnGa (0.2 MJ/m3). The no hysteresis and no residual strain of the magnetostriction along the [001]c axis are interpreted by equal projection to [001]c axis of [111]r of all the domains.

Free Research Field

物性物理