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Title: Stabilizing zero-field skyrmions in Ir/Fe/Co/Pt thin film multilayers by magnetic history control
Authors: Petrović, Alexander Paul
Tomasello, R.
Finocchio, G.
Panagopoulos, Christos
Duong, Nghiep Khoan
Raju, M.
Keywords: Magnetic Hysteresis
Magnetic Force Microscopy
Issue Date: 2019
Source: Duong, N. K., Raju, M., Petrović, A. P., Tomasello, R., Finocchio, G., & Panagopoulos, C. (2019). Stabilizing zero-field skyrmions in Ir/Fe/Co/Pt thin film multilayers by magnetic history control. Applied Physics Letters, 114(7), 072401-. doi:10.1063/1.5080713
Series/Report no.: Applied Physics Letters
Abstract: We present a study of the stability of room-temperature skyrmions in [Ir/Fe/Co/Pt] thin film multilayers, using the First Order Reversal Curve (FORC) technique and magnetic force microscopy (MFM). FORC diagrams reveal irreversible changes in magnetization upon field reversals, which can be correlated with the evolution of local magnetic textures probed by MFM. Using this approach, we have identified two different mechanisms—(1) skyrmion merger and (2) skyrmion nucleation followed by stripe propagation—which facilitate magnetization reversal in a changing magnetic field. Analysing the signatures of these mechanisms in the FORC diagram allows us to identify magnetic “histories”—i.e., precursor field sweep protocols—capable of enhancing the final zero-field skyrmion density. Our results indicate that FORC measurements can play a useful role in characterizing spin topology in thin film multilayers and are particularly suitable for identifying samples in which skyrmion populations can be stabilized at zero field.
ISSN: 0003-6951
Rights: © 2018 Authors. All rights reserved. This paper was published by AIP Publishing in Applied Physics Letters and is made available with permission of Authors.
metadata.item.grantfulltext: embargo_20200226
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