This article is cited in 2 papers

Magnetism

Characteristics of magnetism in nanoporous carbon with palladium clusters

A. M. Danishevskii^a, T. L. Makarova^ab, A. A. Sitnikova^a, B. D. Shanina<sup>c

a</sup> Ioffe Institute, St. Petersburg
^b Umeå University, Department of Physics, Umeå, Sweden
^c Institute of Semiconductor Physics NAS, Kiev

Abstract: The magnetic properties of samples of nanoporous carbon with palladium clusters prepared from polycrystalline SiC have been studied over a wide range of temperatures. The specific magnetic moment rapidly decreases with increasing temperature. The obtained experimental magnetization curves have a nonlinear character but do not reach saturation even in a field of 10 kOe. Being constructed as functions of $H/T$, they lie on a universal curve, which suggests superparamagnetism of the system. The experimental curves have a hysteresis. The coercive force, first, decreases with increasing temperature and, then (in the range of 5–20 K), increases, thus forming a notch singularity. On the contrary, the residual magnetization rapidly decreases with increasing temperature. A conclusion on the prevailing contribution of superparamagnetic clusters to the magnetic subsystem is made.

Received: 18.05.2010
Accepted: 27.10.2010

 English version: Physics of the Solid State, 2011, 53:5, 1017–1024

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