Enhancement of Perpendicular Exchange Bias by Introducing Twin Boundary in Pt/Co/α-Cr2O3/α-V2O3 Epitaxial Film

• Published in: MATERIALS TRANSACTIONS Vol. 60; no. 9; pp. 2028 - 2032
• Main Authors: Shiratsuchi, Yu, Yoshida, Saori, Onoue, Satoshi, Mitsumata, Chiharu, Inami, Nobuhito, Ueno, Tetsuro, Ono, Kanta, Nakatani, Ryoichi
• Format: Journal Article
• Language: English
• Published: Sendai The Japan Institute of Metals and Materials 01-09-2019; Japan Science and Technology Agency
• Subjects: Anisotropy; Bias; Buffer layers; Chromium oxides; Coercivity; Cr2O3; Crystal structure; Crystallinity; Electrons; exchange anisotropy; Exchanging; Flux density; Magnetic anisotropy; spin frustration; Temperature dependence; twin; Twin boundaries; Vanadium oxides
• ISSN: 1345-9678; 1347-5320
• DOI: 10.2320/matertrans.MT-M2019102

Perpendicular exchange anisotropy at the Co/α-Cr2O3 interface was investigated using the two types of films: the film with the single crystalline α-Cr2O3 and that with the twinned α-Cr2O3. Exchange anisotropy energy density JK of the film with the single crystalline α-Cr2O3 was ∼0.09 erg/cm2 whereas JK of the film with the twinned α-Cr2O3 was ∼0.43 erg/cm2, more than 4-times enhancement. We discussed the mechanism of the enhancement of JK based on the exchange coupling at the twin boundary and that the spin frustration at the twin boundary can be the origin of the enhancement of JK.