X-ray Absorption and X-ray Magnetic Circular Dichroism Studies of a Monatomic Fe(001) Layer Facing a Single-Crystalline MgO(001) Tunnel Barrier
作者： Koya Miyokawa , Shinji Saito , Toshikazu Katayama , Toshiaki Saito , Tomoyuki Kamino
DOI: 10.1143/JJAP.44.L9
关键词:
摘要: We studied the electronic and magnetic states of a monatomic bcc Fe(001) layer facing single crystalline MgO(001) tunnel barrier by using X-ray absorption spectroscopy (XAS) circular dichroism (XMCD) at Fe L2,3 core edges in order to clarify origin huge magnetoresistance (TMR) effect observed Fe/MgO/Fe junctions. Both XAS XMCD revealed that 1 ML-Fe is not oxidized, which crucial TMR effect. A sum-rule analysis shows ML-Fe(001) has an enhanced total moment about 2.6 µB per atom compared with bulk Fe.
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