Micromagnetics and magnetoresistance of a Permalloy point contact

Abstract

Room temperature magnetoresistance switching of Permalloy thin films induced by iron nanoparticles Appl. Phys. Lett. 92, 093121 (2008); Negative resistance contribution of a domain-wall structure in a constricted geometry

Frequency- and time-domain investigation of the dynamic properties of interlayer-exchange-coupledNi81Fe19∕Ru∕Ni81Belmeguenai1, Martin2, Woltersdorf3 et al. 2007Phys. Rev. B893482View full textAdd to dashboardCite

“…5 for a NiFe layer of 30 nm in thickness for 0 M ef f = 1.064 T and A = 1.3ϫ 10 −11 J/m. 20 Therefore, in our finite-band PIMM and VNA-FMR setups, we cannot observe PSSW modes ͑P ജ 1͒. The FMR measurements at 22 and 35 GHz show that as the AF coupling strength decreases, the resonance field of the PSSW moves to lower values in the same manner as the optic mode and in good agreement with the theoretical models.…”

Spin-polarised currents and magnetic domain walls

“…Very carefully fabricated contacts, made by much the same method as in Ref. 327, using a nanohole in a membrane, were fabricated by Ozatay et al [385], who formed Ni-Ni contacts with one side exchange biased using FeMn. No effect larger than a fraction of a per cent was found (Fig.…”

“…They made calculations for Co [326] and Permalloy [327] and used these to estimate AMR and domain wall MR, using the Levy-Zhang model [183] for the latter term. In the case of NiFe they compared these to experimental data, and found marked discrepancies, failing even to reproduce the sign of the MR in one of the geometries they consider.…”

Ballistic and diffuse transport through a ferromagnetic domain wall

“…The boundary between the domains, the domain walls ͑DW's͒, are a source of magnetoresistance that recently has attracted experimental [1][2][3][4][5] and theoretical interest. [6][7][8] For ballistic systems, where the electron mean free path is longer than the system size, first-principles band-structure calculations have shown that the DW resistance is enhanced due to the nearly degenerate bands at the Fermi energy.…”