Large negative magnetoresistance and ferromagnetism induced by interfacial spins in granular Cr/C films

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

“…ΔR/R is the relative correction to the resistance in the magnetic field. This relation between the MR and magnetization was reported in some experimental studies [13][14][15][16]. When the distribution of granule sizes is taken into account some deviations from ΔR/R ∝ M 2 tot law are possible [10,11].…”

“…In certain limiting cases, it is possible to obtain an analytical expression for the mean-field approximation. When the magnetic energy MH is larger than the exchange energy J and much larger than temperature, it is possible to take into account only the first minimum (n = 1) in equation (15). In this case cos θ i j is described by the averaging of equation ( 13) over the directions of easy axes.…”

Toward the Origin of Magnetic Field-Dependent Storage Properties: A Case Study on the Supercapacitive Performance of FeCo2O4 Nanofibers

“…The origin of bulk resistance in the ferromagnetic material (FCO nanofibers) in the presence of an external magnetic field is mainly ascribed to the reduction of the symmetry of a magnetized material compared to its nonmagnetic state caused by the simultaneous presence of magnetization and spin–orbit coupling . The external magnetic field increases the overall effective field acting on the localized spins and reduces the spin fluctuation, and therefore, less electron-spin scattering may be expected which leads to the decrement in the bulk resistance of the magnetic material under the external magnetic field of 3 mT. , Contrary to the present results observed in FCO nanofibers, Halder et al showed an increase in the dielectric properties of Mn 3 O 4 under the magnetic field probably due to the difference in the magnetic properties of Mn 3 O 4 with FCO nanofibers …”

“…46 The external magnetic field increases the overall effective field acting on the localized spins and reduces the spin fluctuation, and therefore, less electron-spin scattering may be expected which leads to the decrement in the bulk resistance of the magnetic material under the external magnetic field of 3 mT. 47,48 Contrary to the present results observed in FCO nanofibers, Halder et al showed an increase in the dielectric properties of Mn 3 O 4 under the magnetic field probably due to the difference in the magnetic properties of Mn 3 O 4 with FCO nanofibers. 25 To see the effect of the external magnetic field on the cycled electrode and complementing the above results, ex situ M−H curves are also obtained on the FCO electrodes after five cycles by the VSM technique.…”

Features in low-temperature electrical resistivity of amorphous Cd3As2 films due to hopping conductivity with changing activation energy

“…The negative MR can be originated from several special cases. For instance, the negative MR is usually observed in a ferromagnet, in which the polarization of electrons and their scattering can be affected by a magnetic field [20][21][22][23]. A weak localization of electrons in two-dimensional systems which falls off in the presence of a magnetic field can also result in a negative MR in a low field [24][25][26][27][28].…”