U.S. Philips Corporation

Cornelis W Sillen

Jacobus J Ruigrok

Ulrich E Enz

Ulrich Traxlmayr

Franciscus W Dirne

Wolfgang Binder-Krieglstein

Magnetic head comprising a magnetic core having two core limbs (1,3) formed from a ferrite, which core limbs constitute two core faces located opposite each other, at least one of said core faces having a cladding of a soft-magnetic material having a higher saturation magnetisation than the ferrite, and a non-magnetic transducing gap (11) present between the core faces and having at least one layer of a first metallic material (21) and bonded layers (23) of a second metallic material. The cladding comprises a first cladding layer (15) of an alloy based on Ni-Fe on which a second cladding layer (17) of an amorphous alloy based on Co-Ti and/or Zr and/or Hf-Nb and/or Ta is provided, while the first metallic material, chosen from the group of Mo, Ti, Cr and NiCr, is directly provided on the amorphous alloy of the cladding. (FIG. 2).

Magnetic head having soft-magnetic material cladded core limb faces

Magnetic head, comprising a magnetic core provided by two core limbs (1, 3) formed a ferrite, two cladding layers (11) of a magnetic material provided on the core limbs and having a higher saturation magnetization than the ferrite, a non-magnetic gap (9) present between the cladding layers, and a winding aperture (5) accommodating an electric coil (7). The gap is composed of two insulation layers (13) of an electrically insulating material provided on the cladding layers and having a greater mechanical hardness than the other layers of the gap, two first layers (15) of a first metallic material provided on the inslation layers and two second layers (17) of a second metallic material provided on the first layers and being bonded to each other.

Magnetic head having an electro-chemically inert gap of hard material

Magnetic transducing head comprising a magnetic core having two core limbs (1, 3) formed from a ferrite, a non-magnetizable gap (11) extending between two core faces (1B, 3B) of the core limbs and an electric coil (7) passing through a winding aperture (5). A cladding consisting of a first layer (13) of an Ni-Fe-based alloy is provided on at least one of the core faces, and a second layer (15) of an Fe-Si-Al-based alloy which is provided on the first layer.

Growing community of inventors

Eindhoven, Netherlands

Cornelis W Sillen