Effects of Strain and Buffer Layer on Interfacial Magnetization in Sr${}_2$CrReO${}_6$ Films Determined by Polarized Neutron Reflectometry

Abstract

We have determined the depth-resolved magnetization structures of a series of highly ordered Sr${}_2$CrReO${}_6$ (SCRO) ferrimagnetic epitaxial films via combined studies of x-ray reflectometry, polarized neutron reflectometry and SQUID magnetometry. The SCRO films deposited directly on (LaAlO${}_3$)${}_{0.3}$(Sr${}_2$AlTaO${}_6$)${}_{0.7}$ or SrTiO${}_3$ substrates show reduced magnetization of similar width near the interfaces with the substrates, despite having different degrees of strain. When the SCRO film is deposited on a Sr${}_2$CrNbO${}_6$ (SCNO) double perovskite buffer layer, the width the interfacial region with reduced magnetization is reduced, agreeing with an improved Cr/Re ordering. However, the relative reduction of the magnetization averaged over the interfacial regions are comparable among the three samples. Interestingly, we found that the magnetization suppression region is wider than the Cr/Re antisite disorder region at the interface between SCRO and SCNO.

arXiv comment6 pages, 5 figures, Phys. Rev. B in press

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Cited by in corpus (1)

• Interfacial Magnetism in Complex Oxide Heterostructures Probed by Neutrons and X-rays