6533b7d3fe1ef96bd12608a9
RESEARCH PRODUCT
45° sign switching of effective exchange bias due to competing anisotropies in fully epitaxial Co3FeN/MnN bilayers
Mathias KläuiTomoko YoshidaTetsuya HajiriSamridh JaiswalSamridh JaiswalHartmut ZabelB. BorieM. FilianinaH. Asanosubject
010302 applied physicsCoupling constantMaterials scienceKerr effectCondensed matter physicsCondensed Matter PhysicsMagnetocrystalline anisotropy01 natural sciencesCondensed Matter::Materials ScienceCrystallographyMagnetizationExchange biasFerromagnetism0103 physical sciencesAntiferromagnetismGeneral Materials Science010306 general physicsAnisotropydescription
We report an unusual angular-dependent exchange bias effect in ferromagnet/antiferromagnet bilayers, where both ferromagnet and antiferromagnet are epitaxially grown. Numerical model calculations predict an approximately 45° period for the sign switching of the exchange-bias field, depending on the ratio between magnetocrystalline anisotropy and exchange-coupling constant. The switching of the sign is indicative of a competition between a fourfold magnetocrystalline anisotropy of the ferromagnet and a unidirectional anisotropy field of the exchange coupling. This predicted unusual angular-dependent exchange bias and its magnetization switching process are confirmed by measurements on fully epitaxial Co3FeN/MnN bilayers by longitudinal and transverse magneto-optic Kerr effect magnetometry. These results provide a deeper understanding of the exchange coupling phenomena in fully epitaxial bilayers with tailored materials and open up a complex switching energy landscape engineering by anisotropies.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-12-05 | Journal of Physics: Condensed Matter |