TY - JOUR
T1 - Voltage-controlled magnetic anisotropy in Fe|MgO tunnel junctions studied by x-ray absorption spectroscopy
AU - Miwa, Shinji
AU - Matsuda, Kensho
AU - Tanaka, Kazuhito
AU - Kotani, Yoshinori
AU - Goto, Minori
AU - Nakamura, Tetsuya
AU - Suzuki, Yoshishige
N1 - Publisher Copyright:
© 2015 AIP Publishing LLC.
PY - 2015/10/19
Y1 - 2015/10/19
N2 - In this study, voltage-controlled magnetic anisotropy (VCMA) in Fe|MgO tunnel junctions was investigated via the magneto-optical Kerr effect, soft x-ray absorption spectroscopy, and magnetic circular dichroism spectroscopy. The Fe|MgO tunnel junctions showed enhanced perpendicular magnetic anisotropy under external negative voltage, which induced charge depletion at the Fe|MgO interface. Despite the application of voltages of opposite polarity, no trace of chemical reaction such as a redox reaction attributed to O2- migration was detected in the x-ray absorption spectra of the Fe. The VCMA reported in the Fe|MgO-based magnetic tunnel junctions must therefore originate from phenomena associated with the purely electric effect, that is, surface electron doping and/or redistribution induced by an external electric field.
AB - In this study, voltage-controlled magnetic anisotropy (VCMA) in Fe|MgO tunnel junctions was investigated via the magneto-optical Kerr effect, soft x-ray absorption spectroscopy, and magnetic circular dichroism spectroscopy. The Fe|MgO tunnel junctions showed enhanced perpendicular magnetic anisotropy under external negative voltage, which induced charge depletion at the Fe|MgO interface. Despite the application of voltages of opposite polarity, no trace of chemical reaction such as a redox reaction attributed to O2- migration was detected in the x-ray absorption spectra of the Fe. The VCMA reported in the Fe|MgO-based magnetic tunnel junctions must therefore originate from phenomena associated with the purely electric effect, that is, surface electron doping and/or redistribution induced by an external electric field.
UR - http://www.scopus.com/inward/record.url?scp=84945283177&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84945283177&partnerID=8YFLogxK
U2 - 10.1063/1.4934568
DO - 10.1063/1.4934568
M3 - Article
AN - SCOPUS:84945283177
SN - 0003-6951
VL - 107
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 16
M1 - 162402
ER -