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Magnetic properties of Tb0.28 Dy0.57 Ho0.15 Fe2-x Mnx (x=0,0.05,0.1,0.15,0. 2)
S. Narayana Jammalamadaka, ,
Published in AIP
Volume: 101
Issue: 9
The pseudobinary Laves phase R1 R2 Fe2 magnetostrictive compounds have one degree of freedom by which the largest anisotropy constant K1 is minimized to obtain the best performing material. However, by including a third rare earth element, additional degree of freedom is obtained, which allows a better way to choose a material for application. In the present study, Ho has been chosen as it exhibits positive magnetostriction, similar to Tb and Dy. Substitution of Mn for Fe leads to the realization of improved magnetostriction values and reduction in the anisotropy. In the present paper magnetic properties of Tb0.28 Dy0.57 Ho0.15 Fe2-x Mnx (x=0,0.05,0.1,0.15,0.2) are presented. The compounds have formed in single phase with cubic Laves phase structure. The lattice parameter is found to increase from 7.327 to 7.347 Å with increasing the Mn concentration to 0.2. The FeMn-FeMn distance is less than 2.66 Å, the critical distance below which the Fe and Mn moments could be antiferromagnetically ordered, leading to a decrease in the Curie temperature from 592 to 537 K. At 80 K, saturation magnetization is found to increase from 120 emug (x=0) to 125 emug (x=0.1) and then to decrease to 105 emug (x=0.2). The magnetostriction increases from 1000× 10-6 (x=0) to 1050× 10-6 (x=0.1) with Mn and decreases to 775× 10-6 with further increment of Mn (x=0.2). Spontaneous magnetostriction is found by the splitting of the (440) peak. © 2007 American Institute of Physics.
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JournalJournal of Applied Physics
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Concepts (9)
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    Magnetic anisotropy
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    Magnetic properties
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    Substitution reactions
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    Rare earth elements