Rigid magnetic foam-like behavior in ball-milled FeAl

Kiss, László and Kaptás, Dénes and Balogh, Sára Judit and Bujdosó, László and Kemény, Tamás and Vincze, Imre and Gubicza, Jenő (2004) Rigid magnetic foam-like behavior in ball-milled FeAl. PHYSICAL REVIEW B CONDENSED MATTER, 70 (1). 012408. ISSN 0163-1829

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Abstract

After ball-milling nonmagnetic FeAl a grain structure resembling to a rigid magnetic foam is indicated by Mössbauer spectroscopy. It consists of nanosize nonmagnetic grains with ferromagnetic boundaries formed by about two atomic layers of Fe. The magnetic behavior is uncommon: (i) the transition to the paramagnetic state is glass-like and magnetic relaxation sets in at low temperatures; (ii) the magnitude of the local Fe magnetic moments decreases linearly with temperature; (iii) in high fields a strongly anisotropic ferromagnetic behavior is observed.

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