Goncalves, F.J.T., Paterson, G.W. , Stamps, R.L. , O'Reilly, S., Bowman, R., Gubbiotti, G. and Schmool, D.S. (2016) Competing anisotropies in exchange-biased nanostructured thin films. Physical Review B, 94(5), 054417. (doi: 10.1103/PhysRevB.94.054417)
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Abstract
The magnetic anisotropies of a patterned, exchange biased Fe50 Mn50 /Ni80 Fe20 system are studied using ferromagnetic resonance, supplemented by Brillouin light scattering experiments and Kerr magnetometry. The exchange biased bilayer is partially etched into an antidot geometry so that the system approximates a Ni80 Fe20 layer in contact with antidot structured Fe50 Mn50 . Brillouin light scattering measurements of the spin wave frequency dependence on the wave vector reveal a magnonic band gap as expected for a periodic modulation of the magnetic properties. Analysis of the ferromagnetic resonance spectra reveals eightfold and fourfold contributions to the magnetic anisotropy. Additionally, the antidot patterning decreases the magnitude of the exchange bias and modifies strongly its angular dependence. Softening of all resonance modes is most pronounced for the applied magnetic field aligned within 10◦ of the antidot axis, in the direction of the bias. Given the degree to which one can tailor the ground state, the resulting asymmetry at low frequencies could make this an interesting candidate for applications such as selective/directional microwave filtering and multistate magnetic logic.
| Item Type: | Articles |
|---|---|
| Keywords: | Ferromagnetic, antiferromagnetic, FeMn, NiFe, permalloy, antidot, lattice, anisotropy, exchange bias, nanostructure, thin film, ferromagnetic resonance, FMR, brillouin light scattering, BLS, transmission electron microscopy, TEM, scanning transmission electron microscopy, STEM, electron energy loss spectroscopy, EELS, MOKE. |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Stamps, Professor Robert and Paterson, Dr Gary |
| Authors: | Goncalves, F.J.T., Paterson, G.W., Stamps, R.L., O'Reilly, S., Bowman, R., Gubbiotti, G., and Schmool, D.S. |
| Subjects: | Q Science > QC Physics |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Research Group: | Materials and Condensed Mater Physics (MCMP) |
| Journal Name: | Physical Review B |
| Journal Abbr.: | PRB |
| Publisher: | American Physical Society |
| ISSN: | 2469-9950 |
| ISSN (Online): | 2469-9969 |
| Copyright Holders: | Copyright © 2016 American Physical Society |
| First Published: | First published in Physical Review B 94(5): 054417 |
| Publisher Policy: | Reproduced in accordance with the publisher copyright policy |
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