Exchange bias without directional anisotropy in Permalloy/CoO bilayers
| Autor: | Guanxiong Chen, Sergei Urazhdin, Alexander Mitrofanov, Alexander Kozhanov |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Permalloy
Condensed Matter - Materials Science Materials science Magnetoresistance Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology Magnetic hysteresis Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 01 natural sciences Magnetic anisotropy Condensed Matter::Materials Science Exchange bias Ferromagnetism 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Antiferromagnetism Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Anisotropy |
| DOI: | 10.48550/arxiv.2106.09924 |
| Popis: | We utilize transverse ac susceptibility measurements to characterize magnetic anisotropy in archetypal exchange-bias bilayers of ferromagnet Permalloy (Py) and antiferromagnet CoO. Unidirectional anisotropy is observed for thin Py, but becomes negligible at larger Py thicknesses, even though the directional asymmetry of the magnetic hysteresis loop remains significant. Additional magnetoelectronic measurements, magneto-optical imaging, as well as micromagnetic simulations show that these surprising behaviors are likely associated with asymmetry of spin flop distribution created in CoO during Py magnetization reversal, which facilitates the rotation of the latter back into its field-cooled direction. Our findings suggest new possibilities for efficient realization of multistable nanomagnetic systems for neuromorphic applications. Comment: 12 pages, 8 figures. Comments, including suggestions for relevant citations, are welcome |
| Databáze: | OpenAIRE |
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