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Report No.

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 ($$m, n$$) index in the (LaMnO$$_3$$)$$_m$$/(SrMnO$$_3$$)$$_n$$ 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$$d$$ electrons by observing transition from 2$$p$$ states. We present the magnetic properties of the L$$_5$$S$$_5$$ superlattice on a La$$_{0.3}$$Sr$$_{0.7}$$Al$$_{0.65}$$Ta$$_{0.35}$$O$$_{3}$$(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$$_3$$ layers. In near future, we will perform polarized neutron reflectivity measurements on the suplerlattice to obtain magnetism at interfaces in detail.



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