Influence of an interface layer on the effective coupling at a ferromagnet/antiferromagnet interface |
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| Authors: | K.-H. Chew R.L. Stamps |
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| Affiliation: | 1. Kavli Institute of NanoScience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands;2. Institute for Materials Research, WPI-AIMR, Tohoku University, Sendai 980-8577, Japan;1. Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QG, UK;2. School of Chemistry, University of Southampton, Highfield Campus, Southampton SO17 1BJ, UK;3. Department of Chemistry, North Carolina State University, 2620 Yarbrough Drive, Raleigh, NC 27695, USA;1. Department of Physics, Graduate School of Engineering, Yokohama National University, Yokohama, 240-8501, Japan;2. Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan;3. National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba 305-0047, Japan;4. New Industry Creation Hatchery Center, Tohoku University, 6-6-4 Aramaki Aza Aoba, Aoba-ku, Sendai 980-8579, Japan;5. Institute of Thermophysics, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russia |
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| Abstract: | We examine the exchange anisotropy induced at a ferromagnetic/antiferromagnetic interface when an antiferromagnetic interface layer exists. We show that competition between exchange couplings in the interface layer can result in a ferrimagnetic-like compensation point. This leads to a reversal of the effective field acting on the ferromagnet, and a consequent sign change of the exchange bias for temperatures near the Néel temperature of the antiferromagnet. A surprising result is the sensitive dependence of the compensation point on exchange interactions. Even minute modifications of the exchange interactions near the interface can result in a reversal of the effective field, provided certain conditions are met. |
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