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Tuning the magnetodynamic properties of all-perpendicular spin valves using He+ irradiation

Journal article
Authors S. Jiang
S. J. Chung
L. H. Diez
Q. Tuan Le
F. Magnusson
D. Ravelosona
Johan Åkerman
Published in Aip Advances
Volume 8
Issue 6
ISSN 2158-3226
Publication year 2018
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1063/1.5024472
Keywords magnetic droplet solitons, light-ion irradiation, magnetoresistance, oscillators, excitation, driven, memory, waves, films, Science & Technology - Other Topics, Materials Science, Physics
Subject categories Physical Sciences

Abstract

Using He+ ion irradiation, we demonstrate how the magnetodynamic properties of both ferromagnetic layers in all-perpendicular [Co/Pd]/Cu/[Co/Ni] spin valves can be tuned by varying the He+ ion fluence. As the perpendicular magnetic anisotropy of both layers is gradually reduced by the irradiation, different magnetic configurations can be achieved from all-perpendicular (up arrow up arrow), through orthogonal (->up arrow), to all in-plane (paired right arrows). In addition, both the magnetic damping (alpha) and the inhomogeneous broadening (Delta H-0) of the Co/Ni layer improve substantially with increasing fluence. While the GMR of the spin valve is negatively affected, decreasing linearly from an original value of 1.14% to 0.4% at the maximum fluence of 50x10(14) He+/cm(2), most of the Co/Ni layer improvement is achieved already at a fluence of 10x10(14) He+/cm(2), for which GMR only reduces to 0.9%. (C) 2018 Author(s).

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