Ferromagnetism in V-Fe and Cr-Fe Alloys

Abstract

Saturation magnetizations of V-Fe and Cr-Fe alloys were measured and the results used to determine the average atomic magnetic moment. The linear rate of change of the moment with solute concentration, dp̄B/dC, was found to be −3.286 Bohr magnetons per atom in V-Fe α-phase alloys. Transformation of an approximately equiatomic alloy to the CsCl-ordered α′-phase resulted in a decrease of about 0.4 Bohr magneton in the moment. Subsequent transformation to the σ-phase lowered it by a factor of three. In Cr-Fe solid solution alloys, dp̄B/dC was found to be −2.36 Bohr magnetons per atom.

Effects of composition, temperature, and magnetism on phonons in bcc Fe-V alloys

“…The Curie temperature decreases with V concentration and reaches 300 K near 58% V. 13,44,45 Increasing the vanadium concentration also causes a linear decrease in the average alloy moment approximately as expected for dilution with nonmagnetic atoms although V has a small moment that aligns antiparallel to the Fe moments. 10,17,19,46,47 Our calculations are consistent with these reports and predict that the lattice parameter of the magnetic phase is larger than that of the nonmagnetic phase for most compositions ͓Fig. 5͑b͔͒.…”

“…% V at low temperature. [10][11][12] The Curie temperature is 300 K at approximately 58 at. % V. 13,14 First-principles calculations by several methods have successfully reproduced the trends in the magnetism [15][16][17][18] and predict a strong hybridization of the atomic orbitals, charge transfer from the V to the Fe atoms, and the development of an antiparallel moment at the V atoms.…”

Electronic structure of disordered Fe-V alloys

“…% V, and that the vanadium atoms exhibit a small magnetic moment of Ϫ0.9 B as impurity in a bcc iron host, antiferromagnetically coupled with the iron moments. [6][7][8][9] The dependence of the local moments with the composition in Fe-V alloys was investigated by Maksymowicz by means of a Green function with the continued-fraction technique, including short-range atomic ordering as well as atomic long-range order in a two-sublattice model. 10 A linear decrease of the magnetic moment with the increase of V atoms in the vicinity of iron atoms was obtained from the calculations.…”

Metastable and transient states of chemical ordering in Fe-V nanocrystalline alloys

“…Table II presents some magnetic contributions to the intensity of the ͑110͒ Bragg peak for disordered bcc Fe-V alloys, calculated with the FULLPROF computer code 34 by using the mean atomic magnetic moments measured by Nevitt and Aldred. 46 The magnetic contributions are smaller in the ordered alloys because the mean magnetic moment decreases significantly when the alloy orders. [46][47][48][49] An amorphous phase is seen in diffraction patterns of Fe 0.53 V 0.47 ͓Fig.…”

“…46 The magnetic contributions are smaller in the ordered alloys because the mean magnetic moment decreases significantly when the alloy orders. [46][47][48][49] An amorphous phase is seen in diffraction patterns of Fe 0.53 V 0.47 ͓Fig. 3͑a͔͒, Fe 0.39 V 0.61 and Fe 0.37 V 0.63 ͓Fig.…”