On the ferromagnetism of AlFe2B2 |
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Authors: | M. ElMassalami D. da S. OliveiraH. Takeya |
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Affiliation: | a Instituto de Fisica, Universidade Federal do Rio de Janeiro, CxP l68528, 21945-970 Rio de Janeiro, Brazil b National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan |
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Abstract: | Based on extensive Mossbauer effect (ME) and magnetization measurements, the orthorhombic AlFe2B2 was characterized as a ferromagnet (FM) because this character is evident as an onset of a FM transition at Tc=320 K and characteristic magnetizations isotherms below Tc. At liquid helium temperatures, the magnetization saturates to μsat≈1μB per Fe atom; a value which is half the one reported for the iron metal indicating a relatively more filled 3d band. The ME analysis revealed a hyperfine field H(0) of 88(2) kOe, an isomer shift (relative to Fe) of 0.50(2) mm/s, and a quadrupole parameter of 0.02 mm/s: all parameters extrapolated to zero Kelvin. The itinerant character of the magnetic moment will be discussed. |
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Keywords: | AlFe2B2 Ternary compounds Ferromagnet Mossbauer effect spectroscopy Magnetic properties of intermetallic |
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