Periodic arrays of magnetic nanostructures by depositing Co/Pt multilayers on the barrier layer of ordered anodic alumina templates

Abstract

Crystalline anisotropic magnetoresistance with two-fold and eight-fold symmetry in (In,Fe)As ferromagnetic semiconductor Appl. Phys. Lett. 100, 262409 (2012) Charge order suppression, emergence of ferromagnetism and absence of exchange bias effect in Bi0.25Ca0.75MnO3 nanoparticles: Electron paramagnetic resonance and magnetization studies J. Appl. Phys. 111, 123913 (2012) Vacancy mediated room temperature ferromagnetism in Co-doped Dy2O3 Appl. Phys. Lett. 100, 252411 (2012) Synthesis and characterization of Co2FeAl nanowires J. Appl. Phys. 111, 123906 (2012) Synthesis, structure, and magnetic behavior of nanoparticles of cubic ZnMnO3

Bimodal magnetic force microscopy with capacitive tip-sample distance control

“…2 To investigate the characteristics of this control mode in greater practical detail, we work with a Ta(5 nm)/Pt(5 nm)/ [Co(0.4 nm)/Pt(0.7 nm)] 4 /Pt(3.5 nm) multilayer deposited onto a hexagonal array of domes in an anodic alumina template with 100 nm period, similar to Ref. 11. This sample provides small magnetic features, but also large topographical ones which typically constitute a major difficulty for high-resolution magnetic force microscopy.…”

Enhanced Hall effect in Co/Pd multilayered nanodomes with perpendicular anisotropy

“…The increase in coercivity can be attributed to different mechanisms of magnetization reversal in the array of nanodomes as compared to the continuous film, where similar results have been observed previously in samples with out-of-plane anisotropy deposited in nanostructure substrates. 12,13 It is interesting to note that in the HA sample there is a decrease in the magnetic remanence compared with both the film and the sample with nanodomes of 100 nm. This effect could be a direct consequence of the competition of the out of plane with in-plane anisotropies due to the larger curvature of the 250 nm nanodomes, making that the part of the Co/Pd multilayer being deposited in the interstitial space of the domes contribute to decrease the remanence observed.…”

“…12 The first step consists of the fabrication of NAMs by double anodization technique 14,15 and subsequent removal of the remaining Al by chemical etching, exposing the bottom oxide barrier layer. Two sets of membranes were fabricated, with different anodization voltages in order to obtain different pore sizes.…”

“…However, if we use the bottom side of AAO membranes (barrier layer) we can obtain nanohills or nanodomes films, where the last one shows different magnetic reversion mechanisms and can be interesting in basic and applied research in magnetism. PMA Co/Pt multilayers deposited on alumina barrier layers, forming nanobumps, have been studied before, 12,13 but only bump periods inferior to 100 nm have been analyzed. Larger period with curved surfaces have been studied by deposition of Co/Pd films on self-assembled SiO 2 nanospheres, 5 but with the associated problems mentioned above that are a limiting factor for magnetotransport studies.…”

Magnetic Force Microscopy Characterization of Magnetic Nanowires and Nanotubes

“…Compared with the other magnetometry instruments, MFM has the capacity to map the local stray fields emanating from individual nanostructures, hence providing insight into their magnetic behavior. MFM presents a sufficient resolution to simultaneously provide information about the topography and the static magnetic configuration of individual magnetic nanostructures [29][30][31][32][33][34]. This technique can be used not only as a characterization instrument but also for magnetic reading and writing of individual nanostructures [30].…”