Pressure Dependence of the Curie Temperature of Ferromagnetic Laves Phase Alloys

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  • G. T. Alfieri
    Polytechnic Institute of Brooklyn, Brooklyn, New York 11201
  • E. Banks
    Polytechnic Institute of Brooklyn, Brooklyn, New York 11201
  • K. Kanematsu
    Polytechnic Institute of Brooklyn, Brooklyn, New York 11201

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<jats:p>The pseudobinary system (Zr1−xNbx)Fe2, with the cubic Laves structure, shows ferromagnetism for samples with x≤0.45. The lattice parameter decreases with increasing Nb content, but the major part of the change in TC is not due to this, as was seen in the case of (Zr1−xTix)Fe2. Zr(Fe1−xCox)2 behaves similarly. We have studied the effect of high pressure on the Curie temperatures of some of these alloys, using the method of McWhan. All of these samples show a linear decrease of TC with pressure. In the (Zr, Nb)Fe2 series, dTC/dP=−3.3°K/kbar for x=0.3 and −3.5°K/kbar for x=0.35. The permeability decreases with pressure, and the permeability-temperature curves behave as if the compounds become paramagnetic when the Curie temperature falls below 230°K. This is the Curie temperature (at 1 atm) of (Zr0.6Nb0.4)Fe2, which is the limiting composition of the ferromagnetic region. Zr(Fe1−xCox)2 behaves similarly, with dTC/dP=−4.7°K/kbar for x=0.35 and −6.6°K/kbar for x=0.4.</jats:p>

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