Voltage-controlled magnetic anisotropy in Fe|MgO tunnel junctions studied by x-ray absorption spectroscopy
Creators
- 1. Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531 (Japan)
- 2. Japan Synchrotron Radiation Research Institute/SPring-8, Sayo, Hyogo 679-5198 (Japan)
Description
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
Additional details
Identifiers
- DOI
- 10.1063/1.4934568;
Publishing Information
- Journal Title
- Applied Physics Letters
- Journal Volume
- 107
- Journal Issue
- 16
- Journal Page Range
- p. 162402-162402.4
- ISSN
- 0003-6951
- CODEN
- APPLAB
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 47055919
- Subject category
- S71: CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS;
- Descriptors DEI
- ABSORPTION SPECTROSCOPY; ANISOTROPY; ELECTRIC FIELDS; ELECTRIC POTENTIAL; INTERFACES; KERR EFFECT; MAGNESIUM OXIDES; MAGNETIC CIRCULAR DICHROISM; REDOX REACTIONS; SOFT X RADIATION; SURFACES; TUNNEL EFFECT; X-RAY SPECTRA; X-RAY SPECTROSCOPY
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; CHALCOGENIDES; CHEMICAL REACTIONS; DICHROISM; DIELECTRIC PROPERTIES; ELECTRICAL PROPERTIES; ELECTROMAGNETIC RADIATION; IONIZING RADIATIONS; MAGNESIUM COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RADIATIONS; SPECTRA; SPECTROSCOPY; X RADIATION
Optional Information
- Notes
- (c) 2015 AIP Publishing LLC