Study of magnetism in perovskite manganite superlattice by quantum beam

Kubota, Masato ; Takeda, Masayasu  ; Okamoto, Jun*; Nakao, Hironori*; Murakami, Yoichi*; Yamada, Hiroyuki*; Sawa, Akihito*

It is well-known that various magnetic phases appear such as antiferromagnetic (AF) insulator, ferromagnetic (F) insulator, and F metal for () index in the (LaMnO)/(SrMnO) superlattices. However, it is an open question how the ferromagnetism emerges within the superlattices. A recent progress in soft X-ray scattering technique enables us to directly investigate ordering in 3 electrons by observing transition from 2 states. We present the magnetic properties of the LS superlattice on a LaSrAlTaO(LSAT) substrate by using resonant soft X-ray scattering. We investigated the Q-dependence and the temperature-dependence of the energy spectra around Mn L-absorption-edge. It is found that ferromagnetic moments mainly originate from Mn sites of LaMnO layers. In near future, we will perform polarized neutron reflectivity measurements on the suplerlattice to obtain magnetism at interfaces in detail.