The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper describes the relations among anisotropic field(Hk), sheet resistance (Rs) and power losses in Co-Pd-B-O nano-granular films with various compositions and discuss the mechanism of the noise suppression effect in the case of magnetic thin films. Results demonstrate suitable nano-granular magnetic thin films useful for a noise suppressor in semi-microwave bands.
The article discusses the physical nature of the optimum sheet resistance for the integrated electromagnetic noise suppressor. The system is a microstrip-line with Co-Al-O granular soft magnetic film on top of the signal line. Experimental result shows that there is an optimum sheet resistance which maximize the loss generation at the magnetic materials portion. Loss generation can be maximized by...
In this work, Fe65Co35 alloy which has maximum saturation magnetization (Ms) among all metal magnetic materials was chosen to make Fe65Co35-SiO2 granular films, and the magnetic properties in whole composition were studied. The results show that good high frequency soft magnetic films were obtained by carefully controlling the microstructure. A serious (Fe65Co35)x(SiO2)1-x granular films are fabricated...
In this study, magnetic properties and self-heating characteristics, and biocompatibility of NiFe2O4 nanoparticles were investigated in order to confirm the technical and clinical possibilities for hyperthermia applications. The main reason for considering NiFe2O4 nanoparticles as a hyperthermia agent is that these are expected to have urgently required magnetic properties for hyperthermia such as...
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...
In this paper, we introduce the unique newly material, the hcp disordered Co-Ir alloy with negative uniaxial magnetic anisotropy, and propose a new concept of the ECC media using this new CoIr-SiO2 granular film instead of conventional soft layer material. In real magnetic writing, negative-Kugrain part plays a role of SUL function. Co-Ir alloys with negative-Kugrain shows soft magnetism in the...
L10-FePt is a promising material for ultra high density magnetic recording media due to its high magnetocrystalline anisotropy (Ku). However, the switching field (Hsw) of the L10-FePt particle is too large to write by the currently used write head. Hard/soft stacked media are proposed to solve this problem. Recently, we demonstrated that the coercivity of isolated FePt particles can be reduced by...
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,...
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...
FeCuNbSiB amorphous microwires with average diameter about 40 mum were fabricated by a specially designed melted quench facility. Anneal treatment at T=673K for 1 hour had been carried out for amorphous wires to obtain nanocrystalline grains with average grain diameter of 34 nm. Then, the heat treated microwires were cut into short fibers, the length and diameter ratio was about 2. The composite samples...
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...
DC hysteresigraphs are used to measure the precise and accurate properties of soft magnetic materials. Consequently, an interlaboratory study of ASTM Committee A06 on magnetic properties is initiated. The paper presents the results of this study and indicates some areas of concern about the commercial equipment used for magnetic property measurements.
This study investigates damping constant (alpha) values of soft magnetic materials employing Q-band ferromagnetic resonance (FMR) analyses. The FMR spectra for Ni alloy specimens in addition of Co elements are discussed in detail.
A combination of standard micromagnetic simulations, numerical calculation of energy barriers, and global optimization methods is used to predict the optimum parameters for composite perpendicular media. An exchange spring media consisting of a soft layer grown columnar on top of a hard magnetic layer is used. Micromagnetic simulations show that a soft layer thickness of 10 nm decreases the coercive...
Amorphous and nanocrystalline Fe-based alloys are technologically important materials due to their good magnetic properties and low cost. However, the appearances of the alloys obtained by melt spinning and sputtering techniques are limited to ribbon and strip, film, wire, and powders, which largely restricts their applications in many engineering devices in which big size and arbitrary shape are...
Exchange coupled magnetic nanocomposite powders were obtained by mechanically milling ferromagnetic (FM)-antiferromagnetic (AFM) powders. A shift in the field cooled (FC) hysteresis loop and the coercivity (Hc) enhancement of the FM phase resulting from exchange bias anisotropy was observed. A model based on Preisach hysteresis model was used to calculate the interfacial energy between FM and AFM...
In this paper, the effects of Ta & C compositions and process temperature on magnetic and structural properties of FeTaC films, the composition and temperature dependence of magnetic and structural properties of nanocrystalline FeTaxCy (x =7 - 9, y = 10 -18) soft magnetic films annealed at a temperature range of 400 -550degC in vacuum is presented.
Trilayer films with two 25 nm thick SmCo5 films and intermediate Fe layer of thickness 6 nm and 16 nm have been prepared and compared with a single SmCo5 film of 50 nm thickness. Composition of the SmCo layers and individual layer thicknesses were determined by energy dispersive X-ray analysis (EDX) at various acceleration voltages. The magnetic hysteresis measured along the SmCo5 [001] orientation...
The authors discuss and investigate the characteristics structural, magnetic and current-perpendicular-to-the-plane giant magnetoresistance (CPPGMR) properties of Fe/Co superlattices on an Au electrode. RHEED images showed the surface reconstruction during deposition and indicated that Fe/Co 59 multilayers (MLs) on Au electrode has B2 ordered structure at 400degC substrate temperature.
The magnetostriction and magnetisation of Hiperco 50 soft magnetic material composed of 49wt%Fe, 49%Co, and 2%V are measured simultaneously using an optical technique with a pickup coil. A butterfly shape is observed in the magnetostrictive strain vs. applied field curve at room temperature. This suggests that the alloy has a very low coercive field which is confirmed by the DC hysteresis loop. Magnetostrictive...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.