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MA: Fachverband Magnetismus
MA 8: Magnetic Coupling Phenomena / Exchange Bias
MA 8.3: Vortrag
Montag, 23. März 2009, 15:45–16:00, HSZ 401
Magnetic domain imaging of perpendicular exchange-coupled FM/AFM systems by soft x-ray holography — •Carsten Tieg1, Erika Jiménez2, Julio Camarero2,3, Jan Vogel4, Christophe Arm5, Gilles Gaudin5, Eric Gautier5, Bernard Rodmacq5, Bernard Dieny5, and Rodolfo Miranda2,3 — 1ESRF, B.P 220, 38043 Grenoble, France — 2Dpto. de Física de la Materia Condensada-UAM, 28049 Madrid, Spain — 3IMDEA-Nanociencia, Campus UAM, 28049 Madrid, Spain — 4Institut Néel-CNRS, 38042 Grenoble, France — 5SPINTEC (CNRS/CEA) URA 2512, 38054 Grenoble, France
Magnetic domain imaging by soft x-ray holography was employed to investigate the exchange coupling phenomenon in layered systems composed of ferromagnetic (FM) [Co/Pt]n multilayers with perpendicular anisotropy and antiferromagnetic (AFM) IrMn and FeMn films. We have exploited both element selectivity and the ability to image in applied magnetic fields to follow the magnetization reversal along the hysteresis loop with sub-micrometer resolution. Our setup allows holographic imaging as well as absorption measurements by recording the transmitted intensity or the total electron yield signal. The sensitivity limits of this technique were explored by imaging the uncompensated moments in the AFM layer, which correspond to an equivalent thickness of about one monolayer only. Our domain images show that the uncompensated AFM moments are align parallel to the magnetization of the FM layer.