Spin-wave dispersion in magnetostrictive Fe-Ga alloys: Inelastic neutron scattering measurements

Fe-Ga alloys of appropriate Ga concentration and heat treatment show a very large enhancement in the tetragonal magnetostriction over that of pure α-Fe [λ100(Fe-Ga)∼15λ100(Fe)]. In order to gain further understanding of the extraordinary magnetoelastic characteristics of this system, the spin dynamics of two of these alloys, Fe1−xGax (x=0.160 and 0.225), were studied using inelastic neutron scattering techniques. The correlation of the spin-wave dispersion curve with the lattice constant and atomic radii of solute is examined for this and other Fe alloys. Disciplines Condensed Matter Physics | Metallurgy Comments This article is from Physical Review B 75 (2007): 052406, doi:10.1103/PhysRevB.75.052406. Authors Jerel L. Zarestky, O. Moze, J. W. Lynn, Y. Chen, Thomas A. Lograsso, and Deborah L. Schlagel This article is available at Iowa State University Digital Repository: http://lib.dr.iastate.edu/ameslab_pubs/76 Spin-wave dispersion in magnetostrictive Fe-Ga alloys: Inelastic neutron scattering measurements J. L. Zarestky,1 O. Moze,2 J. W. Lynn,3 Y. Chen,3,4 T. A. Lograsso,5 and D. L. Schlagel5 1Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA 2Dipartimento di Fisica, Università di Modena e Reggio Emilia, Modena 41100, Italy 3NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8562, USA 4Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA 5Ames Laboratory, Materials and Engineering Physics Program, Iowa State University, Ames, Iowa 50011, USA Received 16 November 2006; published 12 February 2007 Fe-Ga alloys of appropriate Ga concentration and heat treatment show a very large enhancement in the tetragonal magnetostriction over that of pure -Fe 100 Fe-Ga 15 100 Fe . In order to gain further understanding of the extraordinary magnetoelastic characteristics of this system, the spin dynamics of two of these alloys, Fe1−xGax x=0.160 and 0.225 , were studied using inelastic neutron scattering techniques. The correlation of the spin-wave dispersion curve with the lattice constant and atomic radii of solute is examined for this and other Fe alloys. DOI: 10.1103/PhysRevB.75.052406 PACS number s : 75.50.Bb, 75.80. q, 78.70.Nx, 63.20. e