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MA: Fachverband Magnetismus
MA 4: Magnetic Coupling Phenomena; Exchange Bias
MA 4.3: Talk
Monday, February 25, 2008, 10:45–11:00, H 1028
Direct observation of dual behaviour of Mn uncompensated spins in the IrMn/NiFe exchange biased bilayers — •S. K. MISHRA1, F. RADU1, D. SCHMITZ2, E. SCHIERLE2, H. A. DÜRR1, and W. EBERHARDT1 — 1BESSY GmbH,Albert Einstein Str. 15, D-12489 ,Berlin, Germany — 2Hahn-Meitner-Institute Berlin, Glienicker Str. 100, D-14109 Berlin, Germany
Exchange bias (EB) refers to the exchange interaction at an interface between ferromagnetic (FM) and antiferromagnetic (AF) bilayers. It is thought to be directly controlled by AF uncompensated spins. Contradictory observations [1,2] assign the origin of the EB to uncompensated AF spins pinned to the AF and FM layers respectively .We have utilized element specific X-ray Resonant Magnetic Scattering (XRMS) to directly probe the Mn uncompensated spins in IrMn/NiFe exchange biased bilayers. XRMS measurements performed by flipping the helicity of X-rays as well as the magnetic field allow us to separate pinned and unpinned AF uncompensated spins. We observed that the number of uncompensated AF spins scale with the EB strength. Up to 100 percent of uncompensated Mn spins are pinned indicating high quality of the interface.
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References:
[1] H. Ohldag, A. Scholl, F. Nolting, E. Arenholz, S. Maat, A.T. Young, M. Carey, and J. Stöhr. Phys. Rev. Lett. 91, 017203 (2003)
[2] M. Tsunoda, T. Nakamura, M. Naka, S. Yoshitaki, C. Mitsumata, M. Takahashi Appl. Phys. Lett. 89, 172501 (2006)