Manipulating exchange bias using all-optical helicity-dependent switching

Abstract

Deterministic all-optical control of magnetization without an applied magnetic field has been reported for different materials such as ferrimagnetic and ferromagnetic thin films and granular recording media. These findings have challenged the understanding of all-optical helicity-dependent switching of magnetization and opened many potential applications for future magnetic information, memory and storage technologies. Here we demonstrate optical control of an antiferromagnetic layer through the exchange bias interaction using the helicity of a femtosecond pulsed laser on IrMn/[Co/Pt]xN antiferromagnetic/ ferromagnetic heterostructures. We show controlled switching of the sign of the exchange bias field without any applied field, only by changing the helicity of the light, and quantify the influence of the laser fluence and the number of light pulses on the exchange bias control. We also present the combined effect of laser pulses and applied magnetic field. This study opens applications in spintronic devices where the exchange bias phenomenon is routinely used to fix the magnetization orientation of a magnetic layer in one direction.

arXiv comment6 pages / 7 figures

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Cited by in corpus (3)

• Creation of Magnetic Skyrmion Bubble Lattices by Ultrafast Laser in Ultrathin Films
• Understanding Field-Free Single-Shot Laser-Induced Reversal of Exchange Bias
• The Multi-Scale Dynamics of All-Optical Exchange Bias Reversal