Ferromagnetic glass on the base of aggregates of Ni amorphous nanogranules

Large Room Temperature Magneto-Resistance in Magnetically Disordered Fe<sub>1.5</sub>Ti<sub>0.5</sub>O<sub>3-δ</sub> Thin Films

“…The random character of the distribution of Ti-formed "holes" within the two Fe planes leads to spatial fluctuations of local magnetization. (The situation is to some extent similar to "ferromagnetic glass" considered in [47], although the microscopic mechanism is different). By our hypotheses the anisotropy of magnetic properties and magneto-resistance can be explained by the magnetic domain structure of magnetically disordered 1.5 0.…”

Tunneling magnetoresistance in ensembles of ferromagnetic granules with exchange interaction and random easy axes of magnetic anisotropy

“…Here s i is the unit vector in the direction of magnetization of the granule i. J is the exchange energy. This model of granular ferromagnetic system was discussed in [31][32][33], with dipole-dipole interaction sometimes added to the energy E. In [34][35][36][37] a similar model without ferromagnetic exchange coupling but with dipole-dipole interaction was treated numerically.…”

Tunneling magnetoresistance in ensembles of ferromagnetic granules with exchange interaction and random easy axes of magnetic anisotropy

“…Here s i is the unit vector in the direction of magnetization of the granule i. J is the exchange energy. This model of granular ferromagnetic system was discussed in [31][32][33], with dipole-dipole interaction sometimes added to the energy E. In [34][35][36][37] a similar model without ferromagnetic exchange coupling but with dipole-dipole interaction was treated numerically. The magnetization of the system is equal to M tot = M i s i .…”