Regensburg 2007 – scientific programme
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MA: Fachverband Magnetismus
MA 27: Micro- and Nanostructured Magnetic Materials II
MA 27.7: Talk
Thursday, March 29, 2007, 16:45–17:00, H22
Influence of nanocrystallinity on the critical behavior of Gadolinium — •Anne-Catherine Probst1, Andreas Michels1, Sharika Nandan Kaul2, and Rainer Birringer1 — 1Technische Physik, Universität des Saarlandes, Saarbrücken, Germany — 2School of Physics, University of Hyderabad, Hyderabad, India
The critical behavior of single crystalline Gadolinium (Gd) at the ferromagnetic-to-paramagnetic
phase transition has been experimentally investigated by Srinath, Kaul, and Kronmüller [1] by means
of high-resolution magnetic susceptibility and magnetization measurements. Their analysis established
that Gd belongs to the uniaxial dipolar universality class with a Curie transition temperature
TC = 292.77 K and an asymptotic critical regime є = ∣ T − TC ∣/TC ≤ 10−3.
This contribution reports on the influence of internal interfaces, in particular, in the form of grain boundaries on the
critical behavior of nanocrystalline bulk Gd prepared by the inert-gas condensation technique. Within this context
we present and discuss near-TC magnetization data (ac-susceptibility, critical isotherm) on a nanocrystalline Gd sample
with an average crystallite size of 15 nm.
S. Srinath, S.N. Kaul, H. Kronmüller, Phys. Rev. B 59, 1145 (1999).