First order magnetisation processes in Pr₂(Co_1-xFe_x)₁₇alloys

Magnetic anisotropy of Tb1−xGdxMn6Sn6 compounds

“…In both cases, FOMP appears in the field applied normal to the easy direction when the energies of the low-and high-moment states coincide. The conditions for the FOMP appearance [6,16] are K 1 40; K 2 o0; 6jK 2 j4K 1 ;…”

High-field low-temperature magnetisation curves of anisotropic ferrimagnets

“…into two, with and without FOMP (domains p and b, respectively). Studying one-sublattice ferromagnets, Melville et al [9] found for this extra boundary a slope of 1/4. Beyond the one-sublattice approximation the line bp has a slight downward curvature (not visible in Fig.…”

“…11b, although they have a finite width and maintain their distinct character at infinity. Finally, for the boundary ak one obtains an equation of a straight line in the spirit of Melville et al [9], k 2 ¼ 1 4 k 1 , by taking the limit h-N in Eq. (33).…”

“…In this limit the system can be regarded as a one-sublattice magnet. The fact that the line bp has a slope of 1/4 near the origin is directly related to the wellknown behaviour of one-sublattice magnets; there the line K 2 /K 1 ¼1/4 in the third quadrant separates the domains of continuous (with a kink) and step-wise saturation [9]. The first-order transition taking place in the latter case is often referred to as first-order magnetisation process (FOMP) [10]).…”

Phenomenological theory of magnetization reversal in nanosystems with competing anisotropies

“…Generally model ( 9) describes magnetic states in a planar ferromagnet with competing uniaxial (second-order) and biaxial (fourth-order) magnetic anisotropy. The model has been applied for many bulk and nanoscale magnetic systems, including reorientation effects in rare-earth orthoferrites [42,49], several classes of intermetallic compounds [50], first-order magnetization processes in highanisotropy materials [38], and for magnetic nanolayers with surface/interface-induced magnetic anisotropy [3,4,8,39,40,46,47]. The model from Eq.…”