Neutron diffraction study on the magnetic structure of Fe2P-based Mn0.66Fe1.29P1−xSix melt-spun ribbons

Moment evolution across the ferromagnetic phase transition of giant magnetocaloric(Mn,Fe)2(P,Si,B)Yibole1, Guillou2, Caron3 et al. 2015Phys. Rev. BSelf Cite28372View full textAdd to dashboardCite

“…6(a), the Mn and Fe magnetic moments for composition A are shown as a function of temperature for a magnetic field of 2 T. The most striking feature is the larger magnetic moments for Mn compared to Fe. This is in line with previous neutron diffraction studies in the ferromagnetic phase [18,22]. This phenomenon was ascribed to the site occupancy, with Mn preferentially occupying the high moment 3g site and Fe the 3f site, which shows a weaker magnetism [18,22,54,55].…”

“…When both sites are * Yibole@tudelft.nl occupied by iron, a clear distinction is found between the low-moment 3f site and the high-moment 3g site [17]. The FOMT of these materials has been extensively characterized; in particular, the structural evolution across the FOMT is now well documented [18][19][20][21][22][23]. All these studies support the magnetoelastic nature of the first-order ferro-to-paramagnetic transition, which leads to a discontinuity in the ratio of the cell parameters (c/a), but keeps the hexagonal structure unmodified with a negligible volume change.…”

Short-range magnetic correlations and spin dynamics in the paramagnetic regime of(Mn,Fe)2(P,Si)

“…Fe atoms preferentially occupy the tetrahedral 3f site, while Mn prefers the pyramidal 3g site [1,4]. The nature of the ferromagnetic (FM) state, e.g., the magnitude and orientation of the magnetic moments, has been studied intensively using neutron diffraction techniques [1,[5][6][7]. As shown in Fig.…”

First-order ferromagnetic transition in single-crystalline (Mn,Fe)2(P,Si)

“…The saturation magnetization of the single crystal is consistent with previous reports on closely related compositions on the basis of bulk magnetometry and neutron diffraction. 12 Here, we can estimate the magnetic anisotropy quantitatively. As usual for a hexagonal system, we consider only the first and second-order anisotropy constants for the magnetocrystalline anisotropy energy E % K 1 sin 2 h þ K 2 sin 4 h, where h is the polar angle between the c axis and the magnetization vector.…”

“…This is consistent with the results from an earlier neutron diffraction study that shows the easy magnetization direction in MnFe(P 1Àx Si x ) compounds lies close to the c axis, with an angle of h ¼ 29 for x ¼ 0.34. 12 It is interesting to note that for MnFe(P,Ge) materials, the magnetic moments lay in the (a, b) plane.…”