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In this work we present preliminary results of the simulations done for a (Zn, Co)O/ZnO/(Zn, Co)O MTJ to obtain the I-V spin dependent characteristics and the TMR using an in-house developed simulator. The Poisson equation and two electron continuity equations, one for each spin, are solved self-consistently to take into account separately the contribution of each spin to the total current. In this...
Co/Pt multilayers were proposed as a new promising media for Nanomagnet Logic computing. Modeling of irradiated Co/Pt films is challenging as Focused Ion Beam (FIB) irradiation locally changes the magnetic properties of the Co/Pt film. We implemented a computational model of partially irradiated nanodots and explained how to exploit asymmetric coupling for designing nanowires and logic gates.
Results of investigations of ferromagnetic nanostructures enclosing the monolayer ferromagnetic nanodisks of various forms as well as multilayer ferromagnetic nanomagnets are presented. Methods of magnetic force microscopy were applied to observe magnetic states in such nanosystems. We have produced the spin-valve elements on the basis of CoFe/AlOx/CoFe, which perform the 10% alteration of the effect...
We have produced Co(tCo)/Cu multilayer and alloy films on a polyimide substrate (1 cm2) with layers grown in the atomic scale using a pulse generator circuit. The induced uniaxial magnetic anisotropy was observed due to the effect of strain in all the multilayer films. The multilayer [Co 1.0 nm/Cu 1.5 nm]50 showed a minimum hysteresis loss. The maximum magnetoresistance (MR) ratio observed was 3.4%...
A submicron sized extraordinary Hall-effect (EHE) sensor for read-out of field-coupled computing devices is presented. The applied sensing structure is suitable to electrically probe the output states of field-coupled magnetic logic gates. Furthermore it reveals details on the magnetic properties of submicron-scale single-domain dots. A `split-current' architecture is chosen, where Hall-sensing takes...
Transparent of ZnO and ZnO-CoO thin films were deposited on glass substrate by the sol-gel and spin-coating method. Significant growth of the intensity of UV photoluminescence for ZnO-CoO film was observed. The EPR-measurements of polycrystalline nanostructures with the addition of cobalt oxide was studied.
Modulation of the surface plasmon wave vector in composite gold/cobalt/gold multilayer films due to periodic magnetization switching in cobalt is observed with a tilted slit-groove microinterferometer.
The magneto-transport properties of ferromagnetic based multilayers are dependent on the film thickness, the surface roughness, the nature of the interlayer and pining layer used for exchange biasing. We investigate how the nature of the spacer-layer affects the magnetoresistance and Hall effect properties of the magnetic multilayers. The effective thicknesses of the oxide layers were estimated by...
We use Ion Beam Proximity Lithography (IBPL) to produce 4 mm times 4 mm arrays of 220 nm dots in perpendicularly - oriented Co/Pd multilayered media. IBPL is used to reduce the size distribution sigmaD of the arrays, and subsequently He+ ion irradiation is used to reduce their anisotropy. The switching field distribution sigmaHcr/HCr is measured for each sample before and after irradiation, and a...
We examine how nominally identical nanostructure can exhibit different switching behaviors in two model systems. The first system consists of an array of perpendicularly magnetized Co/Pd multilayer nanodots. We found that the non-uniformity in switching fields among the nanodots in an array is due to a single grain of weak uniaxial anisotropy. In the second system consisting of in-plane magnetized...
Design considerations and fabrication of bit-patterned magnetic recording media are presented. The application of ion-beam proximity printing, a high-throughput direct-write lithography, to media patterning is evaluated. Ultra-high magnetic anisotropy (Co/Pd)N magnetic multilayers are analyzed as candidates for patterned recording layers. Following patterning, optimized multilayers are shown to exhibit...
Atom probe tomography is used to study the thermal reaction in Co/CU magnetic multilayer samples prepared by ion beam sputtering unto pre-shaped W substrates. Film thickness is chosen to be 2 nm corresponding to the second antiferromagnetic coupling maximum and heat treatments are carried out from room temperature up to 600degC
In this work, a combinatorial approach to the synthesis of magnetic multilayers is explored. Combinatorial libraries of Co/Pd multilayer thin films were prepared using off-axis magnetron sputtering to enable thickness gradients across the wafer-magnetic properties of the multilayers are controlled by the thicknesses of Co and Pd layers in the repeated bi-layer stack. Polar magneto-optical Kerr effect...
We study the applicability of perpendicular exchange-biased Co/Pt multilayers as a reference layer in magnetic spin valves. We specifically focus on spin valves with IrMn-biased and perpendicular synthetic antiferromagnetic structures. The spin valves were deposited by dc magnetron sputtering through a metal shadow mask onto 500 nm thick silicon dioxide films. The shadow mask defined Hall bars with...
The main role played by the Pt buffer layer on the magnetic configuration of the [Pt/Co] multilayer, i.e. on the pattern consisting of closure domains, and the possibility of doubling HE by annealing the[Pt/Co]/NiFe system is shown.
The formation of a parallel magnetic domain wall in the ferromagnetic (FM) Fe layer in Fe/FeF2 systems and antiferromagnetic (AF) FeF2 and MnF2 in Ni/FeF2 and Co/MnF2 bilayers as well as the magnetization reversal of uncompensated Fe interfacial moments in positively and negatively biased Ni/FeF2 was studied. Combining X-ray magnetic circular (XMCD) and linear dichroism (XMLD) measurements allows...
Multilayered Co/Pd nanowire array were obtained from atomic image projection electron beam lithography (AIPEL) and combined novel etching technique using amorphous Si layer. The role of dipolar interaction in magnetic anisotropy of the nanowire array was studied. The structural information were obtained by HR-TEM, XRD, SEM and AFM. The magnetic properties were measured by SQUID and vibrating sample...
In this work, Co/Cu multilayered nanowires with different crystallographic orientations were deposited by template-assisted electrochemical deposition into alumina nanopore arrays. Results showed that by applying magnetic fields during the deposition, the crystallographic texture of Co layers could be effectively influenced. The giant magnetoresistance (GMR) effect decreased with decreasing Cu thicknesses...
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