@article{337ebf3fa35b4665b1d5ef3c02e30aae,
title = "Controlling the magnetic reversal mechanism of exchange biased Mn x O y /Ni 80 Fe 20 bilayers through O + implantation",
abstract = " This work investigates the different magnetic reversal mechanisms of as-grown and oxygen-ion (O + ) implanted Mn x O y /Ni 80 Fe 20 bilayers. A Mn x O y /Ni 80 Fe 20 bilayer was prepared by ion-beam sputter deposition in an Ar + atmosphere using a partially oxidised Mn target. Oxygen implantations were then performed using 8 keV O + ions at fluences of 10 16 , 10 17 and 10 18 ions/cm 2 to modify the exchange bias strength at the Mn x O y /Ni 80 Fe 20 interface. The magnetic, crystallographic and chemical properties of the bilayers before and after O + implantation were studied using transmission electron microscopy, X-ray reflectometry, magnetometry and polarised neutron reflectometry. The results show an overall improved exchange bias and coercivity for the O + implanted bilayers. The 10 17 ions/cm 2 implanted sample shows the greatest improvement in exchange bias and was further studied for its detailed spin-reversal behaviour using polarised neutron reflectometry. Data analysis in the magnetically-trained state reveals a coexistence of coherent rotational and non-coherent magnetic spin reversal in the as-grown sample and a solely coherent spin rotation reversal mechanism for the O + implanted Mn x O y /Ni 80 Fe 20 bilayer.",
keywords = "Exchange bias, Ion-beam implantation, Magnetic reversal, Polarised neutron reflectometry",
author = "Ji Zhang and Causer, {Grace L.} and Xinzhi Liu and Mihail Ionescu and Sean Li and Lin, {Ko Wei} and Frank Klose",
note = "Funding Information: Research was supported by the Australian Government through the Australian Nuclear Science and Technology Organisation (ANSTO) where ion implantations, magnetometry and PNR measurements were conducted (under proposals 5335 and 6223). G.L.C. acknowledges support from the Australian Government Research Training Program Award and the Australian Institute of Nuclear Science and Engineering Postgraduate Research Award. X.L. acknowledges support from the Asia-Oceania Neutron Scattering Association Young Research Fellowship. K.-W.L. acknowledges support from MOST of Taiwan and from ANSTO during a sabbatical leave. Funding Information: Research was supported by the Australian Government through the Australian Nuclear Science and Technology Organisation (ANSTO) where ion implantations, magnetometry and PNR measurements were conducted (under proposals 5335 and 6223). G.L.C. acknowledges support from the Australian Government Research Training Program Award and the Australian Institute of Nuclear Science and Engineering Postgraduate Research Award. X.L. acknowledges support from the Asia-Oceania Neutron Scattering Association Young Research Fellowship. K.-W.L. acknowledges support from MOST of Taiwan and from ANSTO during a sabbatical leave. Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",
year = "2019",
month = apr,
day = "15",
doi = "10.1016/j.jmmm.2018.12.076",
language = "English",
volume = "476",
pages = "437--446",
journal = "Journal of Magnetism and Magnetic Materials",
issn = "0304-8853",
publisher = "Elsevier BV",
}