Chiral asymmetry driven by unidirectional magnetic anisotropy in Spin-Orbitronic systems

Paolo Perna; Fernando Ajejas; Davide Maccariello; Ruben Guerrero; Julio Camarero; Rodolfo Miranda

doi:10.1117/12.2242902

4 November 2016 Chiral asymmetry driven by unidirectional magnetic anisotropy in Spin-Orbitronic systems

Paolo Perna, Fernando Ajejas, Davide Maccariello, Ruben Guerrero, Julio Camarero, Rodolfo Miranda

Proceedings Volume 9931, Spintronics IX; 99312I (2016) https://doi.org/10.1117/12.2242902
Event: SPIE Nanoscience + Engineering, 2016, San Diego, California, United States

Abstract

Spin-Orbit (SO) effects of a ferromagnetic (FM) layer can be artificially modified by interfacial exchange coupling with an anti-ferro magnet (AFM). Non-symmetric magnetization reversals as well as asymmetric transport behaviors are distinctive signatures of the symmetry-breaking induced by such interfacial coupling. We present a complete picture of the symmetry of the SO effects by studying the magneto-transport properties of single FM film and FM/AFM systems (exchanged-biased bilayer and spin-valve structures) with specific in-plane magnetic anisotropy. Single FM films with a well-defined (two-fold) uniaxial magnetic anisotropy display symmetric magnetization reversals and magneto-resistance responses for any value and direction of the applied magnetic field. On the contrary, in the exchange-biased structures, the exchange interaction at the interface between the FM and AFM layers is responsible of chiral asymmetries in magnetization reversal pathways as well as in the magneto-resistance behaviors. Such asymmetries are directly related to the additional unidirectional (one-fold) magnetic anisotropy imposed by the AFM. In particular, chiral reversals and MR responses are found around the magnetization hard-axis direction. This has been shown in FM/AFM bilayer and spin-valve (where the MR outputs are related to different transport phenomena, i.e. anisotropic magneto-resistance and giant magneto-resistance respectively), hence indicating that the chiral asymmetries are intrinsic of systems with unidirectional anisotropy.

Conference Presentation

Citation Download Citation

Paolo Perna, Fernando Ajejas, Davide Maccariello, Ruben Guerrero, Julio Camarero, and Rodolfo Miranda "Chiral asymmetry driven by unidirectional magnetic anisotropy in Spin-Orbitronic systems", Proc. SPIE 9931, Spintronics IX, 99312I (4 November 2016); https://doi.org/10.1117/12.2242902

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available