Skyrmion velocities in FIB irradiated W/CoFeB/MgO thin films
Valentin Ahrens,
Luca Gnoli,
Domenico Giuliano,
Simon Mendisch,
Martina Kiechle,
Fabrizio Riente,
Markus Becherer
Affiliations
Valentin Ahrens
Nanomagnetic Devices Group, Chair of Nano and Quantum Sensors, Department of Electrical and Computer Engineering, Technical University of Munich, Munich, Germany
Luca Gnoli
Department of Electronics and Telecommunications, Politecnico di Torino, Torino, Italy
Domenico Giuliano
Department of Electronics and Telecommunications, Politecnico di Torino, Torino, Italy
Simon Mendisch
Nanomagnetic Devices Group, Chair of Nano and Quantum Sensors, Department of Electrical and Computer Engineering, Technical University of Munich, Munich, Germany
Martina Kiechle
Nanomagnetic Devices Group, Chair of Nano and Quantum Sensors, Department of Electrical and Computer Engineering, Technical University of Munich, Munich, Germany
Fabrizio Riente
Department of Electronics and Telecommunications, Politecnico di Torino, Torino, Italy
Markus Becherer
Nanomagnetic Devices Group, Chair of Nano and Quantum Sensors, Department of Electrical and Computer Engineering, Technical University of Munich, Munich, Germany
In recent years magnetic skyrmions attracted great attention for the possibility to move them with low current density, their intrinsic stability and their robustness against defects and edge roughness compared to other magnetic textures. For applications, it is very important to be able to influence the behaviour of skyrmions locally. In this article, we present an evaluation on the effects of FIB Ga+ irradiation on skyrmion motion in W/CoFeB/MgO thin films. The influence of FIB irradiation is evaluated both, in terms of modification of the skyrmion Hall angle and the skyrmion velocity. An overview of the effects of the pulsing parameters on the skyrmion motion, shows low influence of the pulses rise-time and an external magnetic field. In addition the analysis after the irradiation shows that it influences notably the dynamics of skyrmions. In the irradiated zone the speed and angle of motion of these magnetic textures are strongly reduced.
