Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 35: Poster 2

MA 35.51: Poster

Thursday, September 8, 2022, 16:00–18:00, P4

Magnetic Anisotropies and Large Exchange Bias of Ultrathin Ni0.95Fe0.05/NiFeO Multilayers — Dimitrios Anyfantis¹, Camillo Ballani², Nikolaos Kanistras², Alexandros Barnasas¹, Georg Schmidt², •Evangelos Th. Papaioannou², and Panagiotis Poulopoulos¹ — ¹Department of Materials Science, University of Patras, 26504 Rio, Patras, Greece — ²Institute of Physics, Martin-Luther University Halle-Wittenberg, 06120 Halle, Germany

Magnetic anisotropy at metal/oxide interfaces has played a significant role in the development of technological applications in recording, spintronics, sensors and actuators over the years[1]. In this work we present a novel method to produce high quality Ni(0.95)Fe(0.1)/NiFeO multilayers with the aid of the natural oxidization procedure and with the help of a single magnetron sputtering head [2]. Doping of Ni by only 5% Fe results in enhanced layering quality as X-ray reflectivity reveals. Due to magnetostatic anisotropy, the multilayers were found to be in-plane magnetized. Mild thermal annealing (T = 525 K) results in the enhancement of perpendicular magnetic anisotropy, mainly due to an increase in the uniaxial volume anisotropy term. Temperature-dependent hysteresis measurements between 4-400 K revealed considerable enhancement of coercivity and appearance of strong exchange bias effect.

[1] Dieny, B.; Chshiev, M., Rev. Mod. Phys. 2017, 89, 025008. [2] D. Anyfantis et al., Coatings 2022, 12, 627.