3 edition of TMR research in insulating granular magnetic materials found in the catalog.
TMR research in insulating granular magnetic materials
Includes bibliographical references and index.
|Statement||authors, Shigeo Honda ... [et al.].|
|LC Classifications||TK3421 .T58 2010|
|The Physical Object|
|LC Control Number||2010043919|
Purchase Concise Encyclopedia of Magnetic and Superconducting Materials - 2nd Edition. Print Book & E-Book. ISBN , Spin-dependent tunneling (SDT) is an imbalance in the electric current carried by up- and down-spin electrons tunneling from a ferromagnet through an insulating barrier. A related phenomenon, tunneling magnetoresistance (TMR), is a change in resistance of a magnetic tunnel junction (MTJ) when the magnetization of the two ferromagnetic layers changes its alignment.
a monolithic ﬁeld-effect-transistor-ampliﬁed magnetic ﬁeld sensor in which a granular tunnel magnetoresistive TMR thin ﬁlm, consisting of Co nanoparticles embedded in an insulating SiO2 matrix, is incorporated into the gate of a p-channel Si metal-oxide-semiconductor ﬁeld-effect transistor. In the same time, granular cobalt systems based on an insulating matrix such as Al 2 O 3, SiO 2, CoO, ZrO 2 and inert gas were found to exhibit tunnelling magnetoresistance (TMR). In fact, in magnetic granular systems TMR was already observed long ago in Ni–SiO 2 and Co–SiO 2 [ 12, 13 ], but the discovery of GMR has stimulated the study.
The fabrication issue is the magnetic alignment and thickness (deposition rates should be in the Angstrom-per-second range). The best way of fabricating insulating layer is still under research. Some of the proven materials are Al 2 O 3 tunnel barriers made by depositing a metallic aluminium layer in the range of Å thickness. In addition. In combination with the perovskite material SrTiO 3 as a tunnel barrier, LSMO has exhibited a TMR ratio as high as 1,%. 13 But such a high TMR value is observable only at low temperatures. In order to achieve high TMR at RT, magnetic double perovskites that .
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: TMR Research in Insulating Granular Magnetic Materials (Materials Science and Technologies) (): Honda, Shigeo, Hayashi, Nobuyuki, Sakamoto. Get this from a library. TMR research in insulating granular magnetic materials.
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Book. Dec ; S. Honda. Nobuyuki Hayashi. Sakamoto. Tamotsu Toriyama. Artificially structured materials granular magnetic. The research was accelerated by the discovery of large TMR in granular material where fine particles of magnetic metal were embedded in insulating substances (like aluminum oxide)  .
Due. This is quite important merit for applications. We have searched more desirable granular TMR materials. The results are also shown in Fig.
TMR values up to about 14% can be obtained in the range of 10 4 TMR and ρ, compared with Co–(Al–O) films. Insulating granular films, consisting of nanometer-sized magnetic metal granules and insulating matrix, exhibit tunnel-type GMR that is called tunneling giant magnetoresistance TMR research in insulating granular magnetic materials book.
It is well known that TMR originates from spin-dependent tunneling between magnetic metal granules through insulating intergranules. The research was accelerated by the discovery of large TMR in granular material where fine particles of magnetic metal were embedded in insulating substances (like aluminum oxide)   .
Due. An insulating granular film is located in the lateral gap of a couple of soft magnetic metal films, and it is expected that a large stray magnetic flux (close to the magnitude of saturation magnetization of the soft magnetic metal film) is generated in the narrow space of the gap when the soft magnetic metal film is magnetized by applying a low.
Magnetic nano-grains embedded in an insulating matrix were the first system, where the tunnel magnetoresistance (TMR) has been the percentual volume of the magnetic material approaches its percolation point, the transport mechanism is basically the electron tunneling among magnetic clusters.
Metal-Insulator type nano-granular magnetic (NGM) thin films have been noteworthily developed as several functional magnetic materials. The formation of nano-granular structure is strongly related to the magnitude of heat formation (ΔH) of intergranule g a larger ΔH allows a clearer granular structure to be obtained.
Soft magnetic properties and TMR effect of NGM. We report a large enhancement of the tunneling magneto-dielectric (TMD) effect in Co−MgF 2 granular films induced by doping using a small amount of Si. This minor addition of Si is dispersed uniformly in the MgF 2 matrix and acts by inhibiting the interdiffusion between the Co and MgF 2 phases, thus enhancing the magnetization when compared with the case of the corresponding.
In magnetic systems of nano-meter size, the interplay between spin and charge of electrons provides unique transport phenomena. In magnetic superlattices, magnetic and non-magnetic metallic thin films with thickness of the order of one nano-meter are piled-up alternately. Since the discovery of giant magnetoresistance (GMR) in these superlattices inspin dependent transport phenomena in 4/5(1).
Microstructure, magnetic properties and TMR effect of Fe–SiO 2 granular films investigated by Mössbauer spectroscopy Article in Journal of Magnetism and Magnetic Materials. The first observation of tunneling magnetoresistance (TMR) was made in materials comprising magnetic grains in an insulating matrix in the ' the magnetic material concentration approaches the percolation, electron tunneling occurs among the magnetic islands, with a carrier density given by the equilibrium density of charged grains following a Boltzman distribution.
Metal-Insulator type nano-granular magnetic (NGM) thin films have been noteworthily developed as several functional magnetic materials. The formation of nano-granular structure is strongly related to the magnitude of heat formation (ΔH) of intergranule materials. Forming a larger ΔH allows a clearer granular structure to be obtained.
Soft magnetic properties and TMR effect of NGM films are. Metal-insulator Type Nano-granular Magnetic Thin Films -Soft Magnetic Properties, TMR Effect and Their Applications- S Ohnuma, N Kobayashi, H Fujimori and T Masumoto Research Institute for Electric and Magnetic Materials,Yagiyama-minami, Taihaku-ku, Sendai, Miyagi,Japan Email address: @ Abstract.
Metal. in granular metals embedded in an insulating medium has been interpreted to be a consequence of spin dependent tun-neling between adjacent grains4 and is termed as a granular tunneling magnetoresistance TMR effect. These new per-spectives have led to the investigation of various insulating granular systems with remarkable TMR values.
Co − MgF 2 granular films were deposited on glass substrates by rf co-sputtering at room temperature (RT). The influence of the Co volume fraction, f v, of these granular films on the tunneling magnetoresistance (TMR) and magnetic properties was studied systematically.
In a magnetic field of T, the TMR value at RT initially increases gradually with decreasing f v, reaches its maximum. addition of insulating materials such as oxides and nitrides in the lms, and the best e ect is expected by making the metallic magnetic particles surrounded by insulating matrix.
Metal-insulator granular lms (MIGF) consisting of magnetic metal nano-granules (TMR) research, and no work was performed on the soft magnetic proper-ties of. Abstract. In this paper, we present a review of electron transport properties of magnetic granular films. Magnetic granular films are nanocomposite materials which consist of magnetic nanoparticles embedded in a nonmagnetic matrix or assembling of magnetic nanoparticles.Book Abstract: B.
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