Dr. Paolo Perna Profile

Dr. Paolo Perna

at IMDEA Nanociencia

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Proceedings Article | 4 November 2016 Presentation + Paper

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, 99312I (2016) https://doi.org/10.1117/12.2242902

KEYWORDS: Ferromagnetics, Magnetism, Anisotropy, Fermium, Frequency modulation, Atomic force microscopy, Visualization, Interfaces, Nanostructures, Spintronics

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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.

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