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公开(公告)号：JPH06162497A
公开(公告)日：1994-06-10
申请号：JP19851493
申请日：1993-08-10
Applicant: BASF MAGNETICS GMBH
Inventor： GERUTO FUITSUSHIYAA , ARUFUREETO HAAGEMAIAA , GEERUHARUTO KOTSUKUSU , HARUTOMUUTO HIBUSUTO
Abstract: PURPOSE: To enable the increase of perpendicular coercive force and saturation magnetization without rising a substrate temp. and to improve a reproducing level by subjecting a polymer substrate film to a plasma pretreatment by etching using a prescribed gas then depositing a magnetic material layer by evaporation. CONSTITUTION: The magnetic recording medium formed by laminating cobalt/ chromium layers of coherent ferromagnetic thin layers on the polymer material is subjected to the plasma pretreatment by ion etching or plasma etching using the nitrogen- or oxygen-contg. gas. At this time, the magnetic moment per cobalt atom in the magnetic layer is increased and the perpendicular coercive force is increased. As a result, the recording properties and reproducing level are improved without rising the temp. of the substrate.
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公开(公告)号：JPH06259742A
公开(公告)日：1994-09-16
申请号：JP20168993
申请日：1993-08-13
Applicant: BASF MAGNETICS GMBH
Inventor： GERUTO FUITSUSHIYAA , ARUFUREETO HAAGEMAIAA , HARUTOMUUTO HIBUSUTO
Abstract: PURPOSE: To obtain a magnetic recording medium which causes no cracking, has no internal stress, is uniform and mechanically stable. CONSTITUTION: The magnetic recording medium is constituted of a sheet-shaped polymer substrate at least one main surface of which is pretreated by plasma etching and a metallic contact thin layer which is formed on the treated main surface of the substrate by a PVD method, has 50 to 1000nm thickness, is ferromagnetic and contains cobalt. At least main surfaces of the substrate for the metallic thin layer are denatured in advance by plasma etching with a gas containing at least 5vol.% of oxygen.
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公开(公告)号：JPH06267054A
公开(公告)日：1994-09-22
申请号：JP20169093
申请日：1993-08-13
Applicant: BASF MAGNETICS GMBH
Inventor： GERUTO FUITSUSHIYAA , ARUFUREETO HAAGEMAIAA , HARUTOMUUTO HIBUSUTO
Abstract: PURPOSE: To obtain a magnetic recording medium which is constituted of a sheet-shaped polymer substrate and a metallic contact thin layer formed on a treated main surface of the substrate by a PVD method, having 50 to 1000nm thickness, being ferromagnetic and containing cobalt and which causes no cracking, has no internal stress, is uniform and mechanically stable. CONSTITUTION: The magnetic recording medium is constituted of the sheet- shaped polymer substrate at least one main surface of which is pretreated by ion etching and the metallic contact thin layer which is formed on the treated main surface of the substrate by the PVD method, has 50 to 1000nm thickness, is ferromagnetic and contains cobalt. At least the main surfaces of the substrate for the metallic thin layer are denatured in advance by ion etching with a gas containing nitrogen or oxygen.
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公开(公告)号：JPH06203377A
公开(公告)日：1994-07-22
申请号：JP29032893
申请日：1993-11-19
Applicant: BASF MAGNETICS GMBH
Inventor： ARUFUREETO HAAGEMAIAA , HARUTOMUUTO HIBUSUTO , RIHIYARUTO MAURAA , HERUMUUTO YAKUSHIYU , DEIITAA BOIERURE , YOHANESU HAITSU
Abstract: PURPOSE: To improve the adhesiveness of a magnetic layer to a polymer substrate by irradiating the substrate with UV having such energy density as not to cause ablation in a specified wavelength region by means of excimer laser. CONSTITUTION: A polymer substrate is irradiated with UV having such energy density as not to cause ablation in the wavelength region of 150-400nm by means of a noninterference excimer plan or excimer laser. The energy density depends on the polymer. In this case, UV excimer laser is preferably used and the number of pulses is preferably made as small as 1-25 pulses per unit area of the substrate. The treated substrate is coated with a magnetic coating material prepd. by dispersing a pigment in a binder mixture contg. polyurethane, a dried binder, a dispersant, a lubricant and inorg. filler particles and then orientation with a magnet and smoothening by calendering are carried out.
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