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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 l_C of spin inhomogeneities around the Nd₂Fe₁₄B nanoparticles. The quantity l_C 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 l_C can be described by a model that takes into account the convolution relationship between the nuclear and magnetic microstructure.