Magnetic order in ternary Pt-Fe-Mn alloys

Inelastic neutron scattering and migration energies in FePd

“…After a period of strong research on superalloys for their magnetic [1][2][3][4][5], catalytic [6] and high temperature mechanical [7] properties, nowadays some of them arouse a new interest owing to their possible applications as shape memory alloys [8] and high density recording media because of their large magnetic anisotropy [9,10]. A good knowledge of the ordering processes and of its dynamics is thus a necessary step in any extensive research on those systems.…”

Lattice dynamics and migration enthalpies inCoPt3and FePd

“…Intermetallics and ordered alloys form an important class of materials, and among them those presenting a phase diagram derived from the Au-Cu canonical phase diagram are of outstanding technological importance. After a period of extensive research on superalloys for their magnetic, [1][2][3][4][5] catalytic, 6 and high-temperature mechanical 7 properties, nowadays some of them in the systems of iron-group metals and platinum-group metals arouse new interests, owing to their possible applications as shape memory alloys 8,9 and high-density magnetic recording media because of their strong magnetic anisotropy. [10][11][12] Many properties of interest are linked to their ability to form ordered phases almost in coherence with the disordered matrix.…”

Mixing of 119 µm Radiation Using Ge: Ga Photoconductive Detector

“…Support for this comes from the observation that the Pt3Fe lattice is slightly stretched along the (100) directions, where the frustrated bonds occur. A tetragonal lattice distortion below T , = 164 K with c/a=0.9998 was reported (Bacon and Mason 1966) for Pt,Fe.…”

“…They readily acquire a Cu, Au(L 12) superstructure, with the Pt atoms (non-magnetic, ,upt -0) occupying the centres of the planes of a FCC unit cell, while the Mn (pMn =4.2pB) and Fe (pFe=3.3pB) atoms are statistically distributed on the cube edges. This has been verified by neutron scattering (Bacon and Mason 1966) and x-ray investigations (Vokhmyanin et a1 1978). The unchanged crystalline structure and the extremely weak composition dependence of the lattice parameter make this system ideal for studying the transition from the ordered ferromagnet Pt3Mn (a = 3.89 A) (Pickard and Nathans 1962) to the ordered antiferromagnet Pt,Fe (a = 3.87 A) (Bacon and Crangle 1963).…”

“…For a microscopic understanding of the phase diagram presented, two basically different models have been discussed with some controversy in the literature. The first model proposed by Kelarev et a1 (1972) is based on results from neutron scattering (Pickard and Nathans 1962, Bacon and Crangle 1963, Bacon and Mason 1966, Kelarev et a1 1972, Vokhmyamin et a1 1978. The model assumes that the transition from the ordered FM Pt3Mn (lattice constant a = 3.89 A) to the ordered AF Pt3Fe (a = 3.87 A) takes place on a simple-cubic 'magnetic' lattice (see figures 10(a) and (b)).…”