title: Magnetization at the interface of Cr2O3and paramagnets with large stoner susceptibility.
abstract: From the Cr 2p3/2x-ray magnetic circular dichroism signal, there is clear evidence of interface polarization with overlayers of both Pd and Pt on chromia (Cr2O3). The residual boundary polarization of chomia is stronger for a Pt overlayer than in the case of a Pd overlayer. The reduction of chromia boundary magnetization with a paramagnetic metal overlayer, compared to the free surface, is interpreted as a response to the induced spin polarization in Pt and Pd. Magnetization induced in a Pt overlayer, via proximity to the chromia boundary magnetization, is evident in the polar magneto-optical Kerr measurements. These results are essential to explainations why Pt and Pd are excellent spacer layers for voltage controlled exchange bias, in the [Pd/Co]n/Pd/Cr2O3and [Pt/Co]n/Pt/Cr2O3perpendicular magneto-electric exchange bias systems. The findings pave the way to realize ultra-fast reversal of induced magnetization in a free moment paramagnetic layer, with possible application in voltage-controlled magnetic random access memory.
authors.affiliation: Department of Physics and Astronomy, Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE 68588, United States of America.
authors.forename: Shi
authors.initials: S
authors.lastname: Cao
authors.forename: M
authors.initials: M
authors.lastname: Street
authors.forename: Junlei
authors.initials: J
authors.lastname: Wang
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Xiaozhe
authors.initials: X
authors.lastname: Zhang
authors.forename: Ch
authors.initials: C
authors.lastname: Binek
authors.forename: P A
authors.initials: PA
authors.lastname: Dowben