摘要:
A hybrid semiconductor-ferromagnet device is a device which has micromagnets (Co) deposited on semiconductor (InAs) two-dimensional electrons, and which has a junction structure of positive and negative magnetic field regions using a stray field resulting from the micromagnets. The magnetoresistance measured in the hybrid semiconductor-ferromagnet device has an asymmetrical hall resistance profile, and a change in magnetoresistance thereof is very large. The measured data is well consistent with the calculated results using a diffusive mode and a ballistic model.
摘要:
The present invention relates to a magnetic tunnel junction device and a manufacturing method thereof. The magnetic tunnel junction device includes i) a first magnetic layer having an switchable magnetization direction, ii) a nonmagnetic layer provided on the first magnetic layer, iii) a second magnetic layer provided on the nonmagnetic layer and having a fixed magnetization direction, iv) an oxidation-preventing layer provided on the second magnetic layer, v) a third magnetic layer provided on the oxidation-preventing layer and fixing the magnetization direction of the second magnetic layer through magnetic coupling with the second magnetic layer, and vi) an antiferromagnetic layer provided on the third magnetic layer and fixing a magnetization direction of the third magnetic layer.
摘要:
An apparatus and method for fabricating a carbon thin film are disclosed in the present invention. The apparatus includes a vacuum chamber having a substrate mounted therein, a sputter target inside the vacuum chamber facing into the substrate, a cesium supplying unit inside the vacuum chamber in a shape of a shield to a circumference of the target and supplying cesium vapor onto a surface of the sputter target through a plurality of openings, and a heating wire surrounding the cesium supplying unit and maintaining the cesium supplying unit at a constant pressure.
摘要:
A novel sensor element having low magnetic coercivity and an asymmetric hysteresis characteristic is formed by heating a strip of cobalt alloy in an exidizing atmosphere to form an oxide coating thereon and then the strip is cooled in the presence of a magnetic field of about 0.3 oersteds along its length. The strip is detected by subjecting it to an alternating magnetic interrogation field and passing the resulting magnetic disturbances through signal processing circuits which select pulses produced only once in each interrogation field cycle. The element is deactivated by subjecting it to a magnetic field which eliminates its asymmetry.
摘要:
The present invention provides for a current induced switching magnetoresistance device comprising a magnetic multilayer composed of a first ferromagnetic layer, a nonferromagnetic layer, and a second ferromagnetic layer, wherein the first ferromagnetic layer has an upper electrode, the second ferromagnetic layer pinned by an antiferromagnet, wherein the antiferromagnet contains a lower electrode at its lower part, and the second ferromagnetic layer is embedded with a nano oxide layer. It is preferable to have at least a part of the lower electrode in contact with the second ferromagnetic layer. The magnetoresistance device of the present invention provides a lower critical current (Ic) for the magnetization reversal and has an increased resistance.
摘要:
A fabrication method of a magnetic tunnel junction includes the steps of: forming a magnetic tunnel junction constructed having a first magnetic layer, a tunnel barrier formed at an upper surface of the first magnetic layer and a second magnetic layer formed at an upper surface of the tunnel barrier; and thermally treating the junction rapidly for 5 seconds˜10 minutes at a temperature of 200˜600° C. to re-distribute oxygens in the tunnel barrier and make the interface between the tunnel barrier and the magnetic layer to be even. The tunneling magnetoresistance and thermal stability of the magnetic tunnel junction can be improved through the rapid thermal annealing.
摘要:
The present invention relates to a magnetic tunnel junction device and a manufacturing method thereof. The magnetic tunnel junction device includes i) a first magnetic layer having an switchable magnetization direction, ii) a nonmagnetic layer provided on the first magnetic layer, iii) a second magnetic layer provided on the nonmagnetic layer and having a fixed magnetization direction, iv) an oxidation-preventing layer provided on the second magnetic layer, v) a third magnetic layer provided on the oxidation-preventing layer and fixing the magnetization direction of the second magnetic layer through magnetic coupling with the second magnetic layer, and vi) an antiferromagnetic layer provided on the third magnetic layer and fixing a magnetization direction of the third magnetic layer.
摘要:
Provided is a current induced switching magnetoresistance device comprising a magnetic multilayer composed of a first ferromagnetic layer, a nonferromagnetic layer, and a second ferromagnetic layer, wherein the first ferromagnetic layer has an upper electrode, the second ferromagnetic layer pinned by an antiferromagnet, wherein the antiferromagnet contains a lower electrode at its lower part, and the second ferromagnetic layer is embedded with a nano oxide layer. It is preferable to have at least a part of the lower electrode in contact with the second ferromagnetic layer. The magnetoresistance device provides a lower critical current (Ic) for the magnetization reversal and has an increased resistance.
摘要:
The present invention relates to an underlayer for use in a high density magnetic recording media. More particularly, the invention relates to an underlayer for use in a high density magnetic recording media comprising A1Pd or CoTi intermetallic compound having B2 crystal structure, or Co50Ti50-xMxmetal alloy in which Ti in CoTi intermetallic compound is partly substituted by other substitutional elements while maintaining its B2 crystal structure, or CoTi/Cr of a double thin film structure in which a Cr seed layer is introduced. The underlayer provided by the present invention has a crystal structure and microstructure suitable for a high density magnetic recording media, which makes a good texture structure with a Co-based magnetic layer deposited thereon and shows fine grain size distribution, high coercity and high coercity squareness.
摘要:
A responder for electronic article surveillance apparatus is made by subjecting a plurality of magnetizable elements to heating in the presence of a magnetic field and maintaining the field at a different intensity for each element as it is cooled to provide different magnetic characteristics so that when the responder is subjected to a cyclically varying magnetic interrogation field its several elements produce spaced apart pulses in each cycle.