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A new method is developed to measure the magnetizations in each layer of a multi-layered garnet film. This method combines a single VSM and multiple FMR measurements to completely characterize the magnetic properties of layers. This method can be immediately extended to the case of multiple layers or different materials, as long as the requirement for resolving the FMR absorption peaks for different...
In this paper, the recording performance of two types of media are compared by calculating the head field distribution of an 80 nm wide write pole in conjunction with a soft magnetic underlayer. The maximum effective field was inclined 15deg from the perpendicular axis. The effective head field gradient was a maximum when the head field was inclined 35deg from the perpendicular. Composite media have...
This article presents numerical simulations to study the synchronization of electrically connected STOs (spin transfer oscillators). The motion of the magnetizations mj of the layers F2 of a collection of different STOs were calculated. Each mj is considered as a macrospin without any dipolar interaction with the other mi. Its time evolution is given by a Landau-Lifschitz-Gilbert equation including...
This paper investigates the switching speed in samples having different surfaces (hereafter quoted as "small" or "large" samples), and compares the temperature dependences thereof. The "large" samples are pseudo-spin valves Co75Fe25 (2.5 nm)/Cu(6 nm)/Co75Fe25(40 nm). The top (thin) layer is patterned into an ellipse of size 150times85 nm, while the bottom layer is unpatterned...
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...
Half metallic Fe3O4 with a fully spin-polarized band structure at the Fermi level is one of the most promising materials for magnetic random access memory (MRAM), which stores data in pseudo spin valve (PSV) or magnetic tunneling junction elements. Ordered arrays of such nanostructures provide the basic magnetic architecture required to produce MRAM. Fe3O4 (40 nm) / Cu (tCu) / Ni80Fe20 (30 nm) PSV...
We have demonstrated that magnetic domains can be imaged by X-ray holography. We present images of magnetic domain patterns in various systems containing thin film magnetic multilayers with perpendicular anisotropy. The magnetic reversal of a [Co(1.2 nm)/Pt(0.8 nm)]x50 multilayer was imaged in an applied magnetic field with 50 nm spatial resolution.
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...
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...
In this paper we study the coupling mechanism between the conduction electrons and the allowed spin wave modes of a micron size system. To achieve this goal we investigate the variation of the giant magneto resistance (GMR) effect in a single spin valve sensor as a function of the spin wave mode excited in the system. We couple ferromagnetic resonance technique on a single sensor with transport measurements...
The on-chip integration of microwave passive components is an important issue for electronic industry. The use of magnetic thin films in place of bulk materials is the solution to integrate these components. Hence, it is important to know the electromagnetic properties of magnetic thin film and multilayer structures in the microwave range. Network Analyzer based ferromagnetic resonance (NA-FMR) technique...
This article presents a detailed study of the local magnetic behaviour in TbCo2/FeCo films near the spin reorientation transition (SRT), and explains the behaviour of giant magnetostrictive (GMS) actuators under different driving conditions. 25times(TbCo2 5 nm/FeCo 5 nm) GMS thin films were deposited onto 3times25 mm2, 50 mum Si beams using RF sputtering method. The magnetoelastic coefficient was...
L10 FePt thin films attract attention for extremely high densities beyond 1 Tera bit/in2 due to their large magnetocrystalline anisotropy (7-10times107 ergs/cc). However, chemically ordered [001] FePt films are not easily tailored on conventional substrates. Hetero-epitaxial underlayers, post-annealed FePt multilayer films, and low kinetic deposition have been suggested to develop the [001] c-axis...
In this paper, the magnetic properties of thin SmCo5 film has been studied. A thin sandwich structure, Ru/Cu/Ru, is proposed as a new structure of the underlayer for SmCo5 films with perpendicular magnetic anisotropy. The first Ru layer is deposited to improve the Cu(111) orientation, and the second Ru layer is to restrict the interlayer diffusion between Cu and SmCo5. The Sm-Co films as thin as 10...
In this study, the effects of post annealing temperature ranging from 250 degC to 350 degC on the giant magnetoresistance (GMR) ratio and conductance change (DeltaG) have been investigated. The structure of the GMR spin-valve consists of Cu (10 A) / IrMn (80 A) / CoFe (15 A) / NOL / CoFe (20 A) / Cu (28 A) / CoFe (tf) / NOL / Cu (10 A) / Al2O3 where tf is varied from 10 A to 200 A and NOL is a nano-oxide...
In this article, the authors proposed an alternative method to improve the magnetoresistance (MR) by inserting a thin ferromagnetic (FM) layer in the nonmagnetic (NM) spacer of a basic spin valve (SV) trilayer structure (FM-NM-FM), thus creating a pentalayer structure. It is found that MR value can be doubled by inserting a FM layer with high intrinsic spin polarization, such as halfmetallic CrO2.
There has been intense research effort to increase the magnetoresistance (MR) of current-perpendicular-to-plane (CPP) spin valve, so as to maintain the high rates of areal density growth of magnetic media platters of the hard disk towards 1 Tbit/in2 and beyond. It has been proposed recently that MR can be increased with the insertion of ferromagnetic or half-metalic layers into the basic CPP spin-valve...
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.
Nanoimprint is a promising technique, which allows the replication of nano-objects on a large surface by a low cost and simple process. A Si mould was prepared on an 8 inch diameter wafer by high-resolution e-beam lithography. The reverse image of the pattern was obtained by imprinting a resist at a force of 15 kN. This image is subsequently transferred in Si by reactive ion etching (RIE). The magnetic...
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