公开(公告)号：ES2004550A6

公开(公告)日：1989-01-16

申请号：ES8700650

申请日：1987-03-10

Applicant: IBM

Inventor： TRIPPEL GERHARD ,  BRUNSCH ARWED ,  SCHMIDT CLAUS ,  STEINER WERNER ,  RINK HELMUT

IPC: G11B5/842 ,  G11B5/845

Abstract: METODO Y DISPOSICION PARA MEJORAR LA DISPERSION DE PARTICULAS MAGNETICAS EN UN LIQUIDO CONSTITUIDO POR RESINA Y DISOLVENTE PARA FORMAR UNA COMPOSICION DE REVESTIMIENTO, COMPRENDIENDO EL METODO SOMETER LA COMPOSICION DE REVESTIMIENTO A UN CAMPO MAGNETICO DE PARAMETROS OPTIMOS CON RELACION A LA FRECUENCIA, INTENSIDAD DE CAMPO Y DURACION, DE TAL MODO QUE SE OBTENGA UNA DISTRIBUCION HOMOGENEA DE LAS PARTICULAS MAGNETICAS EN EL LIQUIDO. LA DISPOSICION COMPRENDE DOS ELECTROIMANES (1, 2) QUE FORMAN UN ANGULO ENTRE SI Y QUE ESTAN DISPUESTOS ALREDEDOR DE UN TUBO (3) QUE LLEVA LA COMPOSICION DE REVESTIMIENTO. EL INVENTO ES APLICABLE A LA PRODUCCION DE SOPORTES DE GRABACION MAGNETICOS, TALES COMO DISCOS Y CINTAS MAGNETICAS.

公开(公告)号：CA1160293A

公开(公告)日：1984-01-10

申请号：CA339630

申请日：1979-11-13

Applicant: IBM

Inventor： BRUNSCH ARWED ,  RUH WOLF-DIETER ,  SCHNEIDER JOCHEN ,  TRIPPEL GERHARD

IPC: G01R33/18

Abstract: METHOD OF DIRECTLY DETERMINING THE MAGNETOSTRICTION CONSTANT AND DEVICE FOR CARRYING OUT SAID METHOD The invention provides method and apparatus for determining and measuring the magnetostriction constant of magnetic thin film materials in which said material is applied on a substrate and the thus formed sample clamped at one end being deflected under the influence of a magnetic field through utilizing the respective magnetostriction effect, and the magnetostriction constant being measured via the deflection representing a measure for the magnetostriction constant characterized in that the sample is subjected to a magnetic AC field, wherein the magnetic AC field is frequency adjustable, and the magnetic AC field is adjusted with respect to frequency in such a manner that the sample can be set to vibrate in resonance, and whereupon the vibration amplitude (a, ares) of the sample which is a measure for the magnetostriction constant is determined opto-electrically. .

公开(公告)号：CA1267047A

公开(公告)日：1990-03-27

申请号：CA511437

申请日：1986-06-12

Applicant: IBM

Inventor： BRUNSCH ARWED ,  STEINER WERNER ,  TRIPPEL GERHARD

IPC: G11B5/70 ,  G01N27/74 ,  G01R33/12 ,  G11B5/84 ,  H01F1/28 ,  H01F41/14 ,  H01F41/26

Abstract: METHODS AND ARRANGEMENTS FOR CHARACTERIZING MAGNETIC COATING COMPOSITIONS AS WELL AS IMPROVING MAGNETIC PARTICLE DISPERSIONS A method and an arrangement is provided for characterizing magnetic coating compositions that contain magnetic particles dispersed in a solvent resin matrix. The probe material is subjected to an alternating magnetic field and vertically thereto to a constant magnetic field of appropriate field strength and duration. Via a measuring coil the induced signal in the probe material is monitored and different characteristics, preferably the degree of dispersion, are measured by measuring the magnetic susceptibility of the coating material. By applying a constant magnetic field the degree of dispersion can be changed at least for a certain time. The method and arrangement of the present invention can be incorporated in an in-line system into a coating apparatus to monitor the magnetic characteristica of the coating material as well as to improve and maintain such improved characteristics.

公开(公告)号：BR8703309A

公开(公告)日：1988-03-15

申请号：BR8703309

申请日：1987-06-29

Applicant: IBM

Inventor： TRIPPEL GERHARD ,  BRUNSCH ARWED ,  SCHMIDT CLAUS ,  STEINERA WERNER ,  RINK HELMUT

IPC: G11B5/842 ,  G11B5/845

公开(公告)号：CA1231379A

公开(公告)日：1988-01-12

申请号：CA433476

申请日：1983-07-28

Applicant: IBM

Inventor： BRUNSCH ARWED ,  STEINER WERNER ,  TRIPPEL GERHARD

IPC: G01N27/72 ,  G01N27/74 ,  G01R33/12 ,  G01R33/16 ,  G01N27/76

Abstract: ARRANGEMENT FOR DETERMINING CHARACTERISTICS OF MAGNETIC PARTICLE DISPERSIONS For determining characteristics of coating compositions including magnetic particles, the coating composition is subjected to an alternating magnetic field of selectively variable frequency. The field induced by the coating composition after energization is recorded, and thus the susceptibility of the coating composition is measured. Depending on the selected frequencies, conclusions can be made regarding the degree of dispersion, particle density, and viscosity of the coating composition. The frequency is varied between 1 and 100 cups, and the field intensity of the energizing field should be lower than about 10 Oersted. The coating composition may be static or flowing in a container pipe or conduit which is surrounded by field coils and a measuring coil.

公开(公告)号：CA1189822A

公开(公告)日：1985-07-02

申请号：CA398574

申请日：1982-03-17

Applicant: IBM

Inventor： BRUNSCH ARWED ,  RUH WOLF-DIETER ,  TRIPPEL GERHARD

IPC: G11B5/82 ,  G11B5/64 ,  G11B5/738 ,  G11B5/84 ,  G11B5/851 ,  H01F10/16 ,  H01F41/18 ,  H01F41/20 ,  C23C14/34

Abstract: Method Of Producing A Metallic Thin-Film Magnetic Disk And Arrangement For Implementing This Method Method of and arrangement for producing a metallic thin-film magnetic disk, whereby a chromium undercoat and a magnetic layer, in particular of an FeCoCr alloy, are obliquely sputtered by means of a sputtering system onto a substrate at an angle of incidence of about 60.degree.. The operating pressure of the argon gas atmosphere is between 5 and 15 .mu.bar and the thickness (tCr) of the undercoat, which also influences the coercive field strength, is between about 50 and 180 nm. By means of a sector shutter of suitable shape, the thickness distribution between the inner diameter ID and the outer diameter OD of the storage area of the magnetic disk can be influenced in the desired manner. GE9-80-050