Abstract: Provided are: a metal powder core having a configuration suitable for core loss reduction and strength improvement; a coil component employing this; and a fabrication method for metal powder core. The metal powder core is obtained by dispersing Cu powder among soft magnetic material powder comprising pulverized powder of Fe-based soft magnetic alloy and atomized powder of Fe-based soft magnetic alloy and then by performing compaction. The fabrication method for metal powder core includes: a mixing step of mixing together soft magnetic material powder containing thin-leaf shaped pulverized powder of Fe-based soft magnetic alloy and atomized powder of Fe-based soft magnetic alloy, Cu powder, and a binder and thereby obtaining a mixture; a forming step of performing pressure forming on the mixture obtained at the mixing step; and a heat treatment step of annealing a formed article obtained at the forming step.

Abstract: A method for manufacturing a powder magnetic core using a soft magnetic material powder, wherein the method has: a first step of mixing the soft magnetic material powder with a binder, a second step of subjecting a mixture obtained through the first step to pressure forming, and a third step of subjecting a formed body obtained through the second step to heat treatment. The soft magnetic material powder is an Fe—Cr—Al based alloy powder comprising Fe, Cr and Al. An oxide layer is formed on a surface of the soft magnetic material powder by the heat treatment. The oxide layer has a higher ratio by mass of Al to the sum of Fe, Cr and Al than an alloy phase inside the powder.

Abstract: In a metal powder core constructed from soft magnetic material powder and a coil component employing this, a configuration suitable for reduction of a core loss is provided. The metal powder core constructed from soft magnetic material powder is characterized in that Cu is dispersed among the soft magnetic material powder. It is characterized in that, preferably, the soft magnetic material powder is pulverized powder of soft magnetic alloy ribbon and that Cu is dispersed among the pulverized powder of soft magnetic alloy ribbon. Further, it is characterized in that, preferably, the soft magnetic alloy ribbon is a Fe-based nano crystal alloy ribbon or a Fe-based alloy ribbon showing a Fe-based nano crystalline structure and that the pulverized powder has a nano crystalline structure.

Abstract: It is an objective of the invention to provide a dust core made of an Fe-based amorphous metal powder having excellent magnetic properties, in which the dust core has a higher-than-conventional density, excellent magnetic properties and a high mechanical strength. There is provided a dust core including a mixture powder compacted, the mixture powder including: an Fe-based amorphous metal powder having a crystallization temperature Tx (unit: K), the Fe-based amorphous metal powder being plastically deformed, the plastically deformed metal Fe-based amorphous metal powder having a filling factor in the dust core higher than 80% and not higher than 99%; and a resin binder having a melting point Tm (unit: K), in which the Tx and Tm satisfy a relationship of “Tm/Tx?0.70”.

Abstract: In a coil component of the present invention, a coil member having a plurality of coil lines laminated through an insulating layer is sandwiched by hexagonal ferrite substrates, and the hexagonal ferrite substrate has anisotropy. To have the “anisotropy” means that alignment of the crystal orientation is different according to a direction of the substrate, in other words, that anisotropy is provided in the c-axis orientation of ferrite crystal grains of the hexagonal ferrite substrate. As the result of the “anisotropy”, an initial magnetic permeability is also different according to direction. By using the hexagonal ferrite substrate as a magnetic substrate to sandwich the coil member so as to form a magnetic path, the initial magnetic permeability can be maintained up to a high frequency, and a high-frequency characteristic of impedance generated by the coil lines can be improved.

Abstract: A spin valve magnetic head, providing on a substrate, a laminated structure that has an antiferromagnetic layer, fixation layer, non-magnetic layer and unconstraint layer, and having a first underlayer of Ta, a second underlayer of NiFeCr and a third underlayer of NiFe, which underlayers are interposed between the substrate and the laminated structure.

Abstract: A highly reliable thin film filter for an optical multiplexer/demultiplexer is disclosed, in which defects such as chips or cracks hardly occur in an optical thin film. The thin film filter consists of a glass base plate and the optical thin film formed on the glass base plate surface. A side surface of the optical thin film is at an acute angle, preferably at an angle of 6 to 60 degrees, with the glass base plate surface at a crossing point between the optical thin film side surface and the glass base plate surface on a plane perpendicular to the glass base plate surface. After the optical film is formed on the glass base plate surface and the optical thin film side surface is made by dry-etching, an individual thin film filter element is made by cutting the glass base plate with a dicer or the like. Defects such as chips or cracks do not occur on the optical thin film side surface, since the optical thin film is not cut during the cutting of the glass base plate.

Abstract: A spin valve magnetic head which can offer high output and stable operation is proposed.

Abstract: A magnetoresistive film having a spin valve multi-layer structure has low electrical resistance and high sensitivity. In the magnetoresistive film, an under-layer, a first ferromagnetic layer, a non-magnetic layer, a second ferromagnetic layer, and an antiferromagnetic layer are laminated on a substrate in this order. The magnetization direction of the second ferromagnetic layer is fixed by the antiferromagnetic layer, and the magnetization direction of the first ferromagnetic layer is not fixed. The average grain size of the first ferromagnetic layer ranges from 8 to 14 nm.

Abstract: The change rate of resistance in a multi-layered spin-valve magneto-resistive thin film using a FeMn anti-ferromagnetic layer has been improved. In multi-layered magento-resistive thin film having a first ferromagnetic layer, a non-magnetic layer and a second ferromagnetic layer with an adjoining anti-ferromagnetic layer are laminated on a substrate; the magnetizing direction of each ferromagnetic layer lying in the film surface; the magnetizing direction of the second ferromagnetic layer being pinned by the magnetic exchange coupling field generated by the anti-ferromagnetic layer; and the magnetizing direction of the first ferromagnetic layer not being pinned, the degree of dispersion of lattice spacing, or lattice relaxations at the interface of the second ferromagnetic layer and the anti-ferromagnetic layer is set to equal to or less than 0.5 A.

Abstract: A magnetoresistive (MR) sensor for MR heads comprising a magnetoresistive ferromagnetic layer (MR layer) and an antiferromagnetic layer in direct contact with the surface of the MR layer. The MR layer has a face-centered-cubic (fcc) structure. The crystalline structure of the antiferromagnetic layer is the fcc structure in the vicinity of the interface of the MR layer and the antiferromagnetic layer, and continuously changes to a face-centered-tetragonal (fct) structure toward the surface opposite to the interface. The interface of the MR layer and the antiferromagnetic layer is continuous with respect to the crystalline structure due to the epitaxial growth of the antiferromagnetic layer on the surface of the MR layer.

Abstract: A magnetoresistive (MR) sensor for MR heads comprising a magnetoresistive ferromagnetic layer (MR layer) and an antiferromagnetic layer in direct contact with the surface of the MR layer. The MR layer has a face-centered-cubic (fcc) structure. The crystalline structure of the antiferromagnetic layer is the fcc structure in the vicinity of the interface of the MR layer and the antiferromagnetic layer, and continuously changes to a face-centered-tetragonal (fct) structure toward the surface opposite to the interface. The interface of the MR layer and the antiferromagnetic layer is continuous with respect to the crystalline structure due to the epitaxial growth of the antiferromagnetic layer on the surface of the MR layer.