Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 4: Micro- and Nanostructured Materials
MA 4.4: Vortrag
Montag, 16. März 2015, 10:30–10:45, H 1012
Magnetic hardening of FeCo nanowires — Sara Liébana-Viñas1, •Ruslan Salikhov1, Cristina Bran2, Marina Spasova1, Ulf Wiedwald1, Manuel Vazquez2, and Michael Farle1 — 1University Duisburg-Essen, Duisburg and CENIDE, Germany — 2Institute of Material Science of Madrid (CSIC), Madrid, Spain
We report on the magnetic hardening of FeCo nanowires (NW) by forming few nm thick oxides at both NW tips. FeCo NWs with 20 and 40 nm diameter were synthesized in porous alumina templates. We found that the formation of a 3 nm thick FeCo oxide layer at the NW tips results in an increase of the coercive field by 20% at T = 10 K. Our finding experimentally confirms that magnetic NWs even with large aspect ratios (up to 300) are demagnetized via nucleation of domain walls (DWs) at the NW tips. The magnetic hardening suggests the possibility to improve the performance of FeCo NWs for applications in magnetic field sensors, recording heads and rare-earth free permanent magnets. The importance of DW pinning at both ends of magnetic NWs will be discussed. We acknowledge funding of EU through FP7-REFREEPERMAG.