Voltage-Gated 90° Switching of Bulk Perpendicular Magnetic Anisotropy in Ferrimagnets
Source abstract
Abstract
Unraveling the mechanism behind bulk perpendicular magnetic anisotropy (PMA) in amorphous rare earth-transition metal films has proven challenging. This is largely due to the inherent complexity of the amorphous structure and the entangled potential origins arising from microstructure and atomic structure factors. Here, we present an approach wherein the magneto-electric effect is harnessed to induce 90° switching of bulk PMA in Tb-Co films to in-plane directions by applying voltages of only -1.2 V. This manipulation is achieved by voltage-driven insertion of hydrogen atoms into interstitial sites between Tb and Co atoms, which serves as a perturbation to the local atomic structure. Using angle-dependent X-ray magnetic circular dichroism, we find that the anisotropy switching originates from the distortion of the crystal field around Tb, which reorients the alignment of Tb orbital moments. Initially aligned along Tb-Co bonding directions, the easy magnetization axis undergoes reorientation and switches by 90°, as substantiated by ab initio calculations. Our study not only concludes the atomic origin of Tb-Co atom bonding configuration in shaping bulk PMA but also establishes the groundwork for electrically programmable ferrimagnetic spintronics, such as controlling domain wall motion and programming artificial spin textures.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Magnetic properties of thin films · Magnetic Properties of Alloys · Magnetic and transport properties of perovskites and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
TUD-KIT Joint Research Laboratory Nanomaterials
Technische Universität Darmstadt
Institute of Nanotechnology
Karlsruhe Institute of Technology
Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemistry and Materials Science
Shanxi Normal University
Institute of Materials Science
Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE)
University of Duisburg-Essen
Karlsruhe Nano Micro Facility
Karlsruhe Institute of Technology (KIT)
Department of Materials Science and Engineering
KTH Royal Institute of Technology
Wallenberg Initiative Materials Science for Sustainability
European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France
Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Technology, Research Institute of Materials Science
School of Sustainable Chemical, Biological and Materials Engineering
University of Oklahoma
Funding
Bundesministerium f?r Bildung und Forschung · Deutsche Forschungsgemeinschaft · China Scholarship Council
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