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The current-driven magnetization switching in CoFeB/MgO/CoFeB magnetic tunnel junctions (MTJs) with various free layer materials including synthetic structure was studied in this paper. The MTJ films were deposited on SiO2/Si substrates using RF magnetron sputtering. The tunnel magnetoresistance (TMR) ratios and current-voltage (I-V) characteristics of the the MTJs were measured at room temperature...
In this paper the ferromagnetic properties of Co-doped SnO2 system under room temperature conditions are investigated using X-ray diffraction and vibrating sample magnetometers. The effects of substrates on the magnetic properties of doped films are also studied.
This paper reports on magnetic properties of bulk polycrystalline samples of ln2O3 doped with a wide range of TM ions. Phase purity of the samples was analyzed by means of X-ray diffraction and conductivity was also measured using a four-probe technique. From magnetization-temperature curves (M-T curves), it was shown that Cr doped samples was found to be paramagnetic throughout the whole temperature...
Here we studied the two systems Fe/GaAs(100) and the closely related Fe/InAs(100)to determine the Fe magnetic moment as a function of thickness.Ultra-thin (0.4 -23 nm) Fe layers were epitaxially grown at RT in a UHV MBE chamber on GaAs(100) and InAs(100) substrates.The structural characterisation was performed ex-situ by high-resolution X-ray diffraction and reflectometry (XRR).Magnetic characterisation...
Thick NdFeB films have been prepared by triode sputtering with a deposition rate of 20 mum/hour. Films were deposited on either "cool" substrates or onto substrates heated in the range 300-500degC and then annealed at 750degC for 10 minutes. Magnetic characterisation was carried out at room temperature with an extraction magnetometer in fields of up to 10 T. Microstructures were observed...
Since the Nd3(Fe,Ti)29 phase with monoclinic symmetry and space group A2/m was discovered, much attention has been paid to the substitution of Co for Fe in R3(Fe,TM)29 intermetallic compounds. Recently, it has been shown that in 3:29 compounds Co substitution has a significant effect on their structural and magnetic properties, especially on the nature of the magnetocrystalline anisotropy. Normally,...
In this work, magnetic properties and structure of granular type tilted media of (FePt-Fe3Pt )/MgO are investigated. The reason for choosing Fe3Pt is because the ordered Fe3Pt alloy thin films are found to exhibit large magnetic anisotropy (Kl and K2 are -4x106 erg/cc and 2x107 erg/cc) at room temperature, respectively, and thus a composite grain of FePt and Fe3Pt is expected to tilt the easy axis,...
We present here our results on the synthesis and characterization of transition metal (TM) doped-ZnO nanocrystals, where (TM= Co, Ni, Fe, Cu and Cr). Stable suspensions of these materials were produced in ethanol solution at room-temperature condition. liquors. XRD characterization of doped systems confirmed the exclusive formation of the host ZnO wurtzite structure. The incorporation of dopant species...
Magnetite (Fe3O4) films were grown directly on thin layers of two organic semiconductors (p-conjugated oligomers), 8-hydroxyquinoline aluminium (Alq3) and sexitiophene (T6) by pulsed electron beam deposition, also called channel spark ablation (CSA), for which spin injection effects have been demonstrated at low and room temperatures. The room temperature ferromagnetism for both kind of films found...
When injected spin polarized electrons interact with the magnetic moment of a free layer, their angular momentum becomes transferred to the free layer. If sufficient current is applied, the exerted torque switches the free layer either parallel or anti-parallel to the pinned layer depending on the direction of flow of the current. This type of localized current switching is attractive for an MRAM...
In this study, PtMn nanoparticles were synthesized via a chemical method. After post-annealing at the temperature range of 500~700degC, different grain sizes were obtained. It was found the coercivity, measured at 5 K, decreased with increasing grain size. The exchange-bias was also observed at 5 K under a field-cooling process. The particle size and composition of as-synthesized PtMn nanoparticles...
The soft under layer (SUL) is used to improve write head filed strength, field gradient and read-back signal in perpendicular magnetic media. In this study, four type SUL structures were fabricated. Samples were post-annealed and cooled to room temperature under magnetic field along radial direction. VSM, MFM and Guzik spin stand were used to analyze the magnetic properties, domain structure and noise...
In present study, spark plasma sintering (SPS) technique, an ideal technique for quick jointing different materials, has been introduced to prepare layer structural binary composite Gdx(Gd5Si2Ge2)1-x magnetic refrigerants. In spite of their excellent magneto-thermal properties, the MCE of these materials are usually pronounced only in the vicinity of the magnetic phase transition temperature and decrease...
In this paper, the structure, magnetic properties and magnetic entropy change of Er2-xCexFe17 compounds have been studied. The results show that even crystal structure of the compounds is still the Th2Ni17-type hexagonal by Ce substituting for Er in Er2Fe17 compound, the exchange coupling coefficients have been changed between the Er and Fe sublattices, resulting in the Curie temperature of (Er,Ce)...
In this paper we present a study on the gradual overlap of the first order and second order phase transitions and the related magnetic entropy changes of polycrystalline Ni2+xMn1-xGa (x = 0.16, 0.17,0.18,0.19,0.20). The magnetization measurements were performed on a superconducting quantum interference device (SQUID) made by Quantum Design Inc. X-ray diffraction patterns of Ni2+xMn1-xGa (x =0.16,...
In this work, the effects of post-annealing of CoCrPt-SiO2/Ru perpendicular magnetic recording media on magnetic properties and microstructure have been studied. CoCrPt-SiO2/Ru/Ta thin films were deposited on Si substrate by a dc magnetron sputtering method at room temperature and followed by post-annealing for 30 minutes in the range of 100 ~ 240degC. Magnetic properties such as magnetization, coercivity...
The intrinsic reliability of MTJs is studied via the ramped breakdown voltage (Vbd), which has the benefit of a much shorter measurement time than TDDB where a constant applied voltage is used. Ramped breakdown measurements were performed on wafers at room temperature for both bias polarities.
In this report, we will demonstrate that by simply using a bilayer capping layer of Ru/Ta instead of usually used Ta, the switching field, as well as distribution of switching fields, of magnetic tunnel junctions (MTJ) can be considerably reduced. Two samples with the same MTJ stack of Ta/PtMn/SAF-pinned/AlOx/CoFeB(2 nm) (bottom to top) but capped by different metal layers of Ta and Ru/Ta, correspondingly,...
La(Fe0.88Si0.12)13 and their hydrides show a large magnetocaloric effects which make them the primary candidate for the working materials for a near room temperature magnetic refrigeration.In this paper, structure and magnetocaloric effects of rapidly solidified La(Fe0.88Si0.12)13 alloys after short heat treatments are Rapidly solidified La(Fe0.88Si0.12)13 alloys were prepared using both a melt spinning...
This paper reports the magnetoelectric properties of CoFe2O4-BaTiO3 core-shell structure composites. Crystalline structures of the composites were investigated by X-ray diffractometer (XRD). Magnetic properties were studied using a pulse field magnetometer. Magnetostriction was measured using strain gauge method. AC susceptibility and ME coefficient were investigated using lock-in technique in which...
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