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Using the experimental capability of the novel X-ray diffraction instrumentavailable at the 25 Tesla Florida Split Coil Magnet at the NHMFL, Tallahasseewe present an extensive investigation on the magnetostriction ofpolycrystalline AlFe2B2. The magnetostriction was measured near theferromagnetic transition temperature (Curie temperature TC = 280 K, determinedvia DC magnetization measurements), namely, at 250, 290, and 300 K. AlFe2B2exhibits an anisotropic change in lattice parameters as a function of magneticfield near the Curie temperature, and a monotonic variation as a function ofapplied field has been observed, i.e., the c-axis increases significantly whilethe a- and b-axes decrease with the increasing field in the vicinity of TC,irrespective of the measurement temperature. The volume magnetostrictiondecreases with decreasing temperature and changes its sign across TC. Densityfunctional theory calculations for the non-polarized and spin-polarized(ferromagnetic) models confirm that the observed changes in lattice parametersdue to spin polarization are consistent with the experiment. The relationshipsfor magnetostriction are estimated based on a simplified Landau model thatagrees well with the experimental results.

Magnetostriction of AlFe2B2 in High Magnetic Fields