[21p-B204-1~17] 6.3 酸化物エレクトロニクス

▲ [21p-B204-11] Tunable exchange bias effect in manganese- and nickel-based artificial perovskite superlattice structures

〇(PC)Ramchandra Sahoo¹、R Nanno¹、Y Yamagishi¹、Takuto Soma¹、Akira Ohtomo¹ (1.Tokyo Tech., Dept. Chem. Sci. Eng.)

キーワード：Exchange Bias, Superlattices, Oxide thin films

Multilayers composed of magnetically active materials in the perovskite family are particularly fascinating, with interface ferromagnetism between two antiferromagnets or even between an antiferromagnet and a nonmagnet. Importantly, these systems often exhibit an exchange bias (EB) effect which is very useful for technological purposes such as magnetic field sensors, memories, and read heads. The EB phenomenon is the outcome of the exchange anisotropy at the interface of layered systems having competing magnetic interactions. In this study, we have chosen LaMnO₃ (LMO) as an antiferromagnetic insulator in a bulk form and LaNiO₃ (LNO) as a paramagnetic metal. We have found systematic change of EB effect in [(LMO)_m/(LNO)_n]_r superlattices (SLs), fabricated by using pulsed-laser deposition technique, through detailed analyses on magnetization properties of various SLs.