Dresden 2011 – scientific programme

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MA: Fachverband Magnetismus

MA 9: Magnetic Materials I

MA 9.6: Talk

Monday, March 14, 2011, 16:00–16:15, HSZ 401

Development of magnetic moments in Fe_1−xNi_x - alloys — Benjamin Glaubitz, Stefan Buschhorn, Frank Brüssing, and •Hartmut Zabel — Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum

Fe_1−xNi_x alloys have been studied intensively in the past because of their unique properties, such as the soft magnetic properties at x = 0.8 and the martensitic bcc-fcc transition at x = 0.35. The total magnetic moment as a function of alloy concentration follows by and large the Slater Pauling curve, but not in the region of the martensitic transition, where a strong drop is observed, which has been taken as a sign for strong magneto-volume fluctuations, also known as the invar effect. Using XMCD methods, we have analyzed the individual magnetic moments of Fe and Ni across the alloy concentration range, including their spin and orbital contributions, and we have compared those with the average moments determined by VSM measurements. We find a very good agreement between both methods, with the individual moments showing some fluctuations at the invar concentration but no anomaly. We will discuss the results in the light of recent theoretical predictions [1].

[1] I.A. Abrikosov, A.E. Kissavos, F. Liot, B. Alling, S.I. Simak, O. Peil, A.V. Ruban, Phys. Rev. B 76, 014434 (2007)