The aim is to improve a magnetic field sensor consisting of a cylinder coil (2) with a core of amorphous ferromagnetic metal.

Heating a ferromagnetic metal reduces its magnetization, and it eventually completely loses its magnetism.

The oxygen concentrations in the metallic underlying layer and in the ferromagnetic metal layer are not larger that 100 wt. ppm.

NICKEL : A bright, hard, ductile ferromagnetic metal used as a plating, non-oxidising layer that

The magnetic recording medium comprises a substrate and a Co-based ferromagnetic metal layer formed thereon via a metallic underlying layer.

A region (1) which penetrates through the ferromagnetic metal layer and in which Cr is segregated are formed among the crystalline particles constituting the ferromagnetic metal layer.

The ferromagnetic metal layer comprises 14 to 23 atm% chromium (Cr), 2 to 8 atm% tantalum (Ta) and the balance of cobalt (Co).

According to the invention there is provided nano-particles comprising metal particles of at least one ferromagnetic metal, which metal particles are at least in part encapsulated by graphitic carbon.

Second, the use of higher frequencies (50 Hz) as a metal-ferromagnet decreases dramatically reduces the size of transformers.

The present invention relates to ferromagnetic metal particles comprising a core of a ferromagnetic metal or metal alloy, wherein the surface of the core is covered entirely with a layer of graphitic carbon.

For producing a carbon cluster having a ferromagnetic metal included therein, the cluster is returned to the heating vessel (101) and the vessel (101) is evacuated to a vacuum.

A magnetic recording medium having a high normalized coercive force of a ferromagnetic metal layer and excellent S/N ratio and adaptable to high density recording.

The ferromagnetic metal layer has an oxygen concentration of not more than 100 wt ppm and contains crystal grains with an amorphous grain boundary.

The multilayered flakes include at least one layer pair comprising one thin film crystalline ferromagnetic metal layer (16) adjacent to one thin film dielectric layer (18).

The composite piston (30) thus obtained achieves objects of high precision at a low cost which cannot be achieved with traditional simple pistons made entirely of ferromagnetic metal.