Regensburg 2013 – scientific programme
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MA: Fachverband Magnetismus
MA 45: Magnetic Coupling and Spin Structures
MA 45.13: Talk
Thursday, March 14, 2013, 18:15–18:30, H10
Magnetization reversal in Nd-Fe-B based nanocomposites as seen by magnetic neutron scattering — •Jens-Peter Bick1, Dirk Honecker1, Frank Döbrich1, Kiyonori Suzuki2, Elliot Gilbert3, Henrich Frielinghaus4, Joachim Kohlbrecher5, Jorge Gavilano5, Edward Forgan6, Ralf Schweins7, Peter Lindner7, Rainer Birringer8, and Andreas Michels1 — 1University of Luxembourg, Luxembourg — 2Monash University, Australia — 3ANSTO, Australia — 4JCNS, Germany — 5PSI, Switzerland — 6University of Birmingham, United Kingdom — 7ILL, France — 8Universität des Saarlandes, Germany
We have studied the magnetization-reversal process of a Nd2Fe14B/Fe3B nanocomposite using small-angle neutron scattering. Based on the computation of the autocorrelation function of the spin misalignment we have estimated the characteristic size lC of spin inhomogeneities around the Nd2Fe14B nanoparticles. The quantity lC approaches a constant value of about 12.5 nm (∼ average Nd2Fe14B particle radius) at 14 T and takes on a maximum value of about 18.5 nm at the coercive field of − 0.55 T. The field dependence of lC can be described by a model that takes into account the convolution relationship between the nuclear and magnetic microstructure.