45° sign switching of effective exchange bias due to competing anisotropies in fully epitaxial Co3FeN/MnN bilayers

Hajiri T, Yoshida T, Filianina M, Jaiswal S, Borie B, Asano H, Zabel H, Klaeui M (2018)

Publication Type: Journal article

Publication year: 2018

Journal

Journal of Physics: Condensed Matter Institute of Physics: Hybrid Open Access

Book Volume: 30

Article Number: 015806

Journal Issue: 1

DOI: 10.1088/1361-648X/aa9ba7

Abstract

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.

Involved external institutions

Nagoya University / 名古屋大学 JP Japan (JP) Johannes Gutenberg-Universität Mainz (JGU) DE Germany (DE)

How to cite

APA:

Hajiri, T., Yoshida, T., Filianina, M., Jaiswal, S., Borie, B., Asano, H.,... Klaeui, M. (2018). 45° sign switching of effective exchange bias due to competing anisotropies in fully epitaxial Co3FeN/MnN bilayers. Journal of Physics: Condensed Matter, 30(1). https://doi.org/10.1088/1361-648X/aa9ba7

MLA:

Hajiri, Tetsuya, et al. "45° sign switching of effective exchange bias due to competing anisotropies in fully epitaxial Co3FeN/MnN bilayers." Journal of Physics: Condensed Matter 30.1 (2018).

BibTeX: Download