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The domain wall dynamics during magnetization reversal process of glass-coated amorphous Fe77.5Si7.5B15 bistable microwire was considered. Its domain structure deriving from the magnetoelastic and shape anisotropies consists of an axial single domain and two closure domain structures at the ends, plus an outer radial-helical shell in its surface. This articles report the measured domain wall velocities,...
A detailed study of the anomalies in the ferromagnetic properties of the RNi4Ga compounds with R = Sm, Gd and Tb. Heat capacity measurement of these samples also show anomalies at low temperatures in addition to the peak corresponding to TC. Other magnetic properties such as magnetisation, coercivity, magnetic anisotropy and magnetic domain walls of the samples were also studied.
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...
In this work we will show that the ultimate potential of the composite/exchange spring media is realized if the interfacial domain wall fits inside soft and hard layers. We will analyze the potential of the "domain wall assisted magnetic recording" (DWAMR) using numerical micromagnetics, as well as analytical formulas derived for exchange spring magnets.
The underlying mechanisms for domain wall propagation induced by spin-polarized currents were studied. The critical parameters for current-induced wall motion such as the threshold current density at which the motion sets in, the wall velocity and their temperature dependence, were obtained experimentally. Permalloy rings with nonmagnetic contacts were fabricated for transport measurements.
The authors report on current-induced domain wall (DW) movement in synthetic spin valves. The high exchanged field in synthetic antiferromagnets (SAF) keeps the the magnetization of the pinned layer unchanged during the measurement. Thus, the GMR measurement allows to an accurate determination of the DW position and displacement.
The influence of magnetostatic interactions on a wire domain structure is investigated here using the simplest possible situation: a) the wire has perfect cylindrical shape, b) the magnetic anisotropy is uniaxial with the easy anisotropy axis parallel to the wire axis, c) the material parameters of the wire correspond to a soft magnetic case, Ms2GtK1, where Ms is the saturation magnetization and...
The magnetization configuration and switching mechanism of small patterned submicron and micron scaled magnetic elements of Ni80Fe20 thin film having the elongated Pac-man (EPM) shape is performed using micromagnetic simulation. The reduction of lateral size of elongated Pac-man elements decreases the possibility of domain wall formation, which results in increasing the switching speed. However, the...
The dependence of damping on domain wall motion and velocity in Permalloy nanowires is presented. The domain wall motion in isolated two micron long Permalloy nanowires, with a rectangular cross-section 10 nm thick and 100 nm wide, is simulated using the Landau-Lifshitz Gilbert (LLG) simulation.Interpreting LLG dynamics can be difficult due to the dependence of the results on the Gilbert damping parameter...
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...
We perform fully integrated micromagnetic simulations of patterned recording media to optimize the recording process.Fully integrated simulation contains the induction coil in the write head, the yoke, the pole tips, shields, return pole, recording media and magnetic soft under layer (SUL). The magnetization behavior of the media is calculated by taking into account the interactions and back interactions...
Ballistic magnetoresistance (MR) measurements with large magnetic field were performed using sputtered NiFe film as the MR layer. The origin of MR is deduced from current-driven resistance change measurements. The nanoscale point contact (PC) was formed at the junction of the pinned area, which is covered with a CoPt hard magnetic film, and the free area. Results show that the resistance increased...
The domain wall width (DWW) change of nanocontact systems with various contact shapes for larger and more stable magnetoresistance (MR) ratio is investigated. The magnetic calculations are carried out using the micromagnetics simulation based on Landau-Lifschitz-Gilbert equation.
The aim of the paper is to report on domain wall (DW) motion driven by nanosecond-long current pulses in L-shaped permalloy nanowire fabricated by electron-beam lithography. The nanowires are 40 nm thick, with widths between 100 and 300 nm. In this experiments, a single DW is first nucleated in the bend of the L-shaped wire using a sequence of magnetic fields. The presence of the DW between contacts...
The exponential growth of digital circuit complexity requires to automate their design flows. Automatic synthesis tools and hardware description language such as VHDL allow nowadays to rapidly design very complex circuits containing thousands or even millions of transistors. At each step of the design flow, comparative simulations ensure the coherency among the various views, from the most abstract...
This paper reports the use of phase sensitive X-ray optical elements in the soft X-ray transmission microscope beamline to image the magnetic domain structure of Gd25Fe75 amorphous layer at high spatial resolution. The amorphous magnetic material is deposited by electron beam evaporation onto a polyimid substrate exhibiting a pronounced perpendicular magnetic anisotropy. Observations show a magnetic...
We demonstrated the results of the MR measurement in a single magnetic ring. The measurement was performed at room temperature with applying magnetic fields of constant magnitudes in the direction of the ring plane, while rotating the magnetic ring in its plane. The anisotropic field of the narrow ring forces the local moment aligned to the direction of perimeter of the ring, hence the onion state...
Magnetotransport and current-induced magnetic domain wall displacement is studied in the CoFe layer of a submicron pseudo-spin-valve stripe (Ta/CoFe/Cu/NiFe/Ta) on the oxidized Si wafer. The magnetoresistance (MR) loop and magnetization configurations of the submicron stripe were obtained.
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