Abstract:
Process for the production of permanent magnets, of the kind that allows the production of nanostructured alloys (containing a volume fraction lower than 10% of the rare-earth-based stoichiometric compound) in the form of a multilayered material, comprising a stoichiometric hard phase containing rare earths localized in a series of stacked layers intercalated by soft ferromagnetic layers. According to the invention, comprises producing nanostructured elements along a respective vertical axis by means of an inkjet printing system and the parallelization of such productive phase, by means of matrices of productive elements.
Abstract:
The present disclosure relates to the fabrication of spin transfer torque memory devices and spin logic devices, wherein a strain engineered interface is formed within at least one magnet within these devices. In one embodiment, the spin transfer torque memory devices may include a free magnetic layer stack comprising a crystalline magnetic layer abutting a crystalline stressor layer. In another embodiment, the spin logic devices may include an input magnet, an output magnet; wherein at least one of the input magnet and the output magnet comprises a crystalline magnetic layer abutting crystalline stressor layer and/or the crystalline magnetic layer abutting a crystalline spin-coherent channel extending between the input magnet and the output magnet.
Abstract:
The magnetic recording medium of the present invention has a substrate, a perpendicular magnetic recording layer, and a soft magnetic layer formed therebetween, having a thickness of less than 100 nm, the soft magnetic layer having a magnetic anisotropy in a surface direction, and product Bs Hc, which is a production of a saturation magnetic flux density Bs and a coercive force Hc, of not less than 79 T Aim (10 kG Oe). By making the thickness of the soft magnetic layer into the above-mentioned range, the magnetic anisotropy in surface direction can be stabilized. magnetostatic energy can be increased sufficiently by making the Bs • He the above-mentioned range. Therefore, generating of the magnetic wall in the soft magnetic layer can be suppressed, the noise generating from the soft magnetic layer can be suppressed, and a high-density recording is enabled.
Abstract:
A magnetic thin film which can be produced by the same dry process as that for a magnetoresistance element forming a reproduction head, and is provided with excellent soft magnetic characteristics suitable as a recording head magnetic pole material and having a saturation magnetic flux density of at least 2T and a coercive force of up to 2 Oe; a production method therefor; and a magnetic head using it, a magnetic recording device and a magnetic device. The magnetic thin film is characterized by being an iron carbide film having a martensite ( alpha ') phase as its main phase and containing at least carbon and iron as constituting elements. This iron carbide film is preferably in a form consisting of alpha ' single phase, is a magnetic thin film specified by having a diffraction peak from alpha '-phase's (002) plane observed as a main peak by an X-ray diffraction method or an electron beam diffraction method, is provided with a body-centered tetragonal structure, and has a difficult-to-magnetize c-axis approximately vertical to the film surface and an easy-to-magnetize c-plane approximately horizontal to the film surface.
Abstract:
A method of fabricating anisotropic magnetic films includes providing a substrate (18), sputtering a layer (24) of Ni x Fe y (where x ranges from 40 to 50 and y = (100-x)) onto a surface (28) of the substrate, and subjecting the layer of Ni x Fe y to a rotating magnetic field (36) during the sputtering deposition process. A magnetic storage medium comprising a substrate (128), a soft magnetic underlayer (126) supported by the substrate, the soft magnetic underlayer including Ni x Fe y (where x ranges from 40 to 50 and y = (100-x)) and having an easy axis in a circumferential direction and a hard axis in a radial direction, and a magnetically hard recording layer (124) supported by the soft magnetic underlayer, is also included.
Abstract:
A thin film rare earth permanent magnet capable of making the thin film by vapor growth anisotropic ina lamination direction, and a method for manufacturing the permanent magnet. There are repeated a number of operations to form atomic laminate units (13) by laminating a monoatomic layer (10) of a rare earth element on a substrate (1) of a non-magnetic material having a flat smoothness and then by laminating an atomic laminate (12) of a transient metal element having a plurality of monoatomic layers (11) of a transient metal element, so that the atomic laminate units (13) of a characteristic construction are laminated in a plurality of layers. As a result, each atomic laminate (12) has an easily magnetizable axis in the laminate direction of the monoatomic layers (11), and is sandwiched between the monoatomic layers (10, 10) of the rare earth element so that an inverse magnetic domain is suppressed to establish a strong coercive force. Moreover, the content of the transient metal element to the rare earth metal is raised to improve the residual magnetic flux density drastically.