Neutron diffraction studies of the magnetic disorder in ZnxMg0.8−xNi0.2Fe2O4 ferrite with x=0.0, 0.2, 0.4 and 0.6

Order−Disorder Transitions and Magnetic Behaviour in Lithium Ferrites Li0.5+0.5xFe2.5−1.5xTixO4 (x = 1.28 and 1.50)

“…Moreover, it is noticeable that there is a considerable broadening of the (111) reflection, which suggests the presence of magnetic spin clusters. [22] Such a variation was not observed for our sample x ϭ 1.50, from which the experimental data indicate a characteristic spin-glass behaviour. …”

Neutron diffraction studies of the magnetic ordering in the spinel oxide system Mg Co1−Cr Fe2−O4

“…It may be observed that huge diffuse signal exists below the 111 Bragg peak in the low temperature patterns (below T C ) while the bottom pattern shows only Q-linear paramagnetic background. This diffuse signal is thus absolutely of magnetic origin and is a clear indication of the formation of magnetic spin clusters in this composition [5,9,[11][12][13][14][15]. Together with the infinite magnetic LRO of the axial spin components finite shortrange clusters of the transverse spin components coexist in this compound.…”

“…Selective substitution of nonmagnetic or magnetic atoms can alter the strengths of the exchange integrals significantly giving rise to many interesting spin configurations in the spinel compounds. This fascinating feature stimulated extensive research on spinel compounds and quite a large variety of magnetic configurations and disordered states have been reported from various kinds of studies [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. There have been few reports on the effect of substitution of Cr for Fe in the spinels CoFe 2 O 4 and MgFe 2 O 4 [16][17][18].…”

“…In order to have a deeper understanding of the magnetic properties of such spinels, it is essential to look into the change in magnetic ordering arising from the substitutions. Neutron diffraction is much more suitable to characterize such complex systems magnetically since it can provide clear evidence of the presence of magnetic long-range order (LRO) and short range order (SRO) and the magnitudes and orientation of the sublattice magnetic moments [5,[10][11][12][13]. In view of that the quaternary spinel system Mg x Co 1−x Cr x Fe 2−x O 4 (x = 0.0, 0.25, 0.50, 0.75 and 1.0) was chosen for neutron diffraction study as functions of composition as well as temperature to have a clear understanding of the magnetic ordering in such a doubly substituted system.…”

"Magnetic Properties of Nano Crystalline Nickel, Samariumdoped Zinc Ferrite"

“…Nano-Ferrites of Zn 1-x-y Ni y Sm x Fe 2 O 4 , have technological importance as they can play a role in the miniaturization process of several microwave components [1][2]. It has been known in literature [3][4][5] that the substitution of Zinc in the bulk ferrites enabled a substantial modification of electrical and magnetic properties.…”