Abstract: Thin-film magnetic head comprising a substrate (2), an inductive element (23) and a magnetoresistive element (7), and substantially parallel extending flux guides of a magnetic conducting material for magnetic cooperation with said elements. The flux guides are mutually arranged in such a way that two pairs of flux guides (3A, 3B; 5A, 5B) mutually separated by an insulation layer (19) of a non-magnetic material are present, a first pair constituting a first magnetic circuit, provided with a write gap (27), for the inductive element and a second pair constituting a second magnetic circuit, provided with a read gap (17), for the magnetoresistive element.

Abstract: 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).

Abstract: Magnetic head including a core (1, 3) of soft magnetic material having a contact face (7) and a winding aperture (5) and a coil (14) wound around the core. A layer (13) of a superconducting material is present in the non-magnetic transducing gap (11) in the core and a layer (15) of a superconducting material is provided on at least a plurality of the outer faces, for example the side faces (17).

Abstract: System comprising a magnetic head (1) and a magnetic information carrier (2), which cooperate with each other through a layer (3) with soft magnetic and lubricating properties. The layer (3) is anisotropic, the relative permeability (.mu.x) of the layer, taken in a direction parallel to the head face (2), being less than the relative permeability (.mu.y) of the layer in a direction perpendicular to the head face (9). By using the said layer in systems in which a certain distance between the magnetic head (1) and the information carrier (2) is desirable, the magnetic resistance is reduced and the signal-to-noise ratio is improved. The layer (3) may be present on both the magnetic head (1) and on the information carrier (2) as well as on both of them.

Abstract: Thin-film transformer, for example suitable for use in a thin-film magnetic head, comprising a magnetic yoke composed of two magnetically permeable thin layers 3 and 5 and a primary turn constituted by an electrically conducting thin layer 13 and a secondary turn constituted by an electrically conducting thin layer 15. A thin layer 21 of a superconducting material is provided between the layer 3 and the said turns, or the turns are closely fitted together and made of a superconducting material themselves.

Abstract: Device is provided for reading information from a magnetic recording medium, comprising a SQUID (15), a magnetic yoke formed from two flux guides (3 and 5) and a face (13) for magnetic flux coupling of the SQUID with the magnetic recording medium. The SQUID is provided with connection means (33) for a detection circuit (35).

Abstract: Thin-film magnetic head including an inductive transducing element (15) and a face (3) for magnetic flux coupling of the transducing element with a magnetic recording medium. A first magnetically permeable layer (5) and a second similar layer (7) together constitute a transducing gap (11). To improve the transducing function a layer (21) of a superconducting material is provided between the layers (5) and (7).

Abstract: Thin-film transformer suitable for use in a thin-film magnetic head has two magnetically permeable thin layers 3 and 5 primary turn constituted by an electrically conducting which form a magnetic yoke. A layer 13 and a secondary turn constituted by an electrically conducting layer 15 are located in the yoke. A layer 21 of a superconducting material is provided between the layer 3 and the turns, or the turns are closely fitted together and made of a superconducting material themselves.

Abstract: Thin-film magnetic head including a magnetoresistive element (1) and a face (9) for magnetically coupling the element with a magnetic recording medium. A magnetic yoke constituted by three layers (3, 5, 7) of a magnetically permeable material has a gap (13) which is bridged by the magnetoresistive element. A layer (15) of a superconducting material for improving the efficiency of the magnetic head is provided between the layers (3) and (5) and the element (1) on the one hand and the layer (7) on the other hand. For protection from external disturbing magnetic fields and reduction of stray flux a layer (43A, 43B, respectively) of a superconducting material is provided on the layers (3) and (5) and under the layer (7).

Abstract: 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.

Abstract: A magnetic sensor for sensing magnetic fields including two flat layers of electrically conductive ferromagnetic material (11, 16) each having an in-plane easy axis of magnetization (EA.sub.1, EA.sub.2) and each producing a resistance variation under the influence of a magnetic field Ha which originates from a source at an edge of the layer, which layers are situated a small distance apart parallel with respect to each other. In order to increase the sensor's sensitivity to small magnetic fields, in operation the layers (11, 16) convey currents flowing in the same direction and are connected in parallel to the input terminals of a detection circuit (2, 9).

Abstract: A core of a soft-magnetic material with a comparatively low saturation magnetization has layers of a soft-magnetic material with a higher saturation magnetization on the gap-bounding faces. To compensate for the uneven frequency response cause by the non-magnetic transition zones between the material of the core and the layers of soft-magnetic material, the layers of soft-magnetic material on the gap-bounding faces have different thicknesses.

Abstract: A magnetic transducing head (1), for scanning a magnetic recording medium (14) which comprises a magnetizable surface (16) for retaining information in the form of a previously determined information pattern which is characterized by a restricted wavelength band, has a transducing gap (10) which is filled by a spacer consisting of a number (.gtoreq.4) of layers (11) of a material of low magnetic permeability extending parallel to the core faces (6, 7) and forming sub-gaps, a layer (12) of higher permeability being interposed between every two successive layers (11) of low permeability. As a result of this the head (1) has a very high efficiency, while by adjusting in particular the spacings between the sub-gaps the head (1) can be given a desired band filter action.