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Spin-polarized scanning tunneling microscopy and spectroscopy (SP-STM/STS) opens up new real atomic scale magnetism. Interlayer exchange coupling of ultrathin Fe(001) films grown on the antiferromagnetically stacked bct-Mn(001) layers have been studied. The ordered c(2x2)-MnAu(001) surface alloy films were studied and found a high magnetic moment for Mn spins (>4 Bohr magneton), an antiferromagnetic...
The structure and magnetism and their correlation for the NiAs-type Mn50(Te50-xSbx) (NA-MTS) pseudo-single crystal films. The composition of the films was determined by X-ray fluorescence analysis. The crystal structure was investigated by XRD method. The magnetic properties such as saturation magnetic moments, magnetic transition temperatures and saturation magnetization were measured by a SQUID...
This paper investigates the magnetic properties of the FeCr2S4 and FeIn2S4 with special emphasis on cation ordering related to the quadrupole interactions. In order to study microscopic interaction mechanism, the Mossbauer spectra of sulphur spinel have been studied. The Neel temperatures were found to be 175 and 15 K for the FeCr2S4 and FeIn2S4, respectively, by Mossbauer spectroscopy. It can be...
In this work, magnetic properties of melt-spun B-rich (10 at%) and Nb/Ta-containning nanocomposite alloys based on the formula (Nd0.75Pr0.25)y(TM)90-y-xMxB10 (TM=Fe, Fe0.90Co0.1, M=Nb, Ta; y=8, 10; x=0,2,4) were determined by means of VSM measurements. Nanocomposite alloys were obtained from devitrification of initially fully amorphous precursors. Considerable enhancement of the intrinsic coercivity...
In this paper, the microstructure and magnetic properties of the Fe3B/(Pr,Tb)2Fe14B nanocomposite permanent magnets obtained from melt-spun powders with composition of Pr4.2Tb0.3Fe78B17.5 by applying spark plasma sintering (SPS) was discussed. Since the magnetic properties such as remanence (Br) and coercivity (Hci) will deteriorate dramatically due to excessive grain growth during sintering process...
This paper investigates a new class of coupled and continuous (CGC) perpendicular media consisting of CoCrPt-SiO2 granular layer with magnetically-decoupled small grains. This paper describes the role of inter-granular exchange coupling in the recording performance of CGC media structure.
One of the main challenges in magnetic recording is to obtain a sufficient high thermal stability and at the same time a good writeability of the media. Recently, composite media and exchange spring media were proposed in order to shift the problem of writeability to higher areal densities. A similar concept can be applied to a recently proposed recording media called percolation media. In this paper,...
This paper presents detailed micromagnetic analysis of the magnetization reversal characteristics and recording properties and comparison with the conventional granular perpendicular media (GPM) will be discussed. The percolated perpendicular media (PPM) consists of exchange coupled magnetic grains with strong perpendicular anisotropy and, more or less uniformly and relatively densely distributed...
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...
Detailed knowledge of magnetization reversal and possible magnetic configurations in magnetic nanostructures is essential for high-density magnetic memory. Magnetism of nanostructured magnets, of size comparable to or smaller than ferromagnetic domain size, offers a great potential for new physics. We present results of a systematic study of magnetic reversal in sub-100 nm nanodots, and how this reversal...
This paper presents the first quantitative evaluation of the pinned uncompensated spin (UCS) density on the scale of single grains obtained from high lateral resolution magnetic force microscopy. All measurements presented were performed on one ferromagnetic-antiferromagnetic (FM/AFM) multilayer sample that contained a Co/Pt multilayer as ferromagnetic layer and CoO as an AFM layer. TEM of the CoO...
FePt:C composite films with large magnetocrystalline anisotropy are in-situ fabricated in this study by sputter deposition. The microstructure and magnetic properties of the films are investigated using X-ray diffraction, transmission electron microscopy and polar magneto-optical Kerr analysis. Well-defined grain boundaries and relatively uniform grain with mean diameter of 5.6 nm are obtained by...
In this paper, the antiferromagnetic (AF) NiMn exchange coupled-CoFe films exhibit excellent soft magnetic behaviors with very strong anisotropy at 90deg of the pinning direction is discussed. This led to very high ferromagnetic resonance frequency (FMR) up to 10 GHz with high permeability. These antiferromagnetic exchange coupled multilayers offer new and promising issues for magnetic microwave applications.
A composite nanowire geometry consisting of soft magnetic (Ni) nanowire lower part and hard magnetic (CoPt) L10 nanowire upper part, has been prepared by electrodeposition into anodized aluminum oxide (AAO) nanopores with ~20-30 nm diameter, ~100 nm tall. The as-deposited nanowires within the AAO pores were then annealed at 700 degree C for 1 hour for conversion to L10 phase. The The microstructure...
A systematic study of parallel and perpendicular exchange bias as well as magnetic anisotropy in [FePt/FeMn]10 multilayers is performed. The dependence of exchange bias (HE) and the unidirectional anisotropy constant (JK) on the thickness of FePt layer is investigated. The dependence of blocking temperature (TB) and exchange bias on the FeMn thickness is also investigated.
In this study, the formation of L12-Mn3Rh and L12-Mn3Ru phases were examined, in accordance with the recipe of L12-phase formation for Mn-Ir. The exchange biasing properties of the bilayers with these L12 phases were investigated.
This study investigates the exchange bias for Co2Cr0.6Fe0.4Al (CCFA) thin films epitaxially grown on MgO buffer layers. The CCFA/Ru/Co90Fe10 (CoFe) trilayers exchange biased with an IrMn layer through the CoFe/IrMn interface is investigated. Antiferromagnetic coupling was well established for all the CCFA/Ru/CoFe trilayers with tCCTA of between 2.5 and 4.0 nm and thus confirming that the CCFA/Ru/CoFe...
The angular dependence of the magnetization reversal curves reflect a complicated behavior due to the competition between uniaxial and unidirectional anisotropy contributions. Here we present an alternative route to study these phenomena by employing rippled substrates prepared by ion erosion. The magnetization reversal behavior of the F layer and the exchange bias system was then investigated by...
In this study, the growth of epitaxial (001) Co50Fe50/IrMn bilayers by using the epitaxial Cu underlayers on Si substrates, instead of the previously reported MgO substrates is demonstrated using dc magnetron sputtering. The highly conductive Cu underlayers can be used as bottom leads in magnetic tunneling junctions (MTJs). In addition, the anisotropy constants and the magnetization reversal mechanism...
The interaction of an antiferromagnet with a ferromagnet can establish a unidirectional anisotropy, which is referred to as an exchange bias. This paper presents a numerical simulations based on a simple coherent rotation model, which imply that the initial irreversibilities observed between the first and second hysteresis loop are driven by the symmetry of the antiferromagnet. The availability of...
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