公开(公告)号：JPH04116401A

公开(公告)日：1992-04-16

申请号：JP23343890

申请日：1990-09-05

Applicant: IBM

Inventor： WATANUKI MASAAKI ,  SAI FUMINORI ,  SUEOKA KUNIAKI

IPC: G01B7/34 ,  G01N37/00 ,  G01Q60/10 ,  G01Q60/16 ,  G01Q60/50 ,  G01Q90/00 ,  G01R33/02 ,  G01R33/038 ,  G01R33/10 ,  G01R33/12 ,  H01J37/28

Abstract: PURPOSE: To observe a magnetic field in the vicinity of the surface of a sample in scanning tunnel michroscopic mode by providing means for extracting the specific frequency component of a tunneling current generated through interaction of the magnetic field and magnetic moment. CONSTITUTION: The magnetic field observing system comprises a cantilever 16, a chip 12 supported on a cantilever 16 and having a magnetic moment at least at the forward end thereof, and means for applying a voltage between the chip 12 and the surface of a sample. The system further comprises means for keeping a distance between the chip 12 and the surface of a sample at a level permitting a tunnel current flow, and means for extracting a specific frequency component of a tunnel current generated through interaction of a magnetic field connected electrically with the chip 12 and the magnetic moment. While keeping the distance between the chip 12 and the surface of the sample at a level permitting a tunnel current flow, a magnetic field alternating at a specific frequency is generated and the chip 12 is oscillated through interaction of the magnetic moment and the magnetic field. Finaly, the specific frequency component of the tunnel current is extracted.

公开(公告)号：JPS62232000A

公开(公告)日：1987-10-12

申请号：JP6502886

申请日：1986-03-25

Applicant: IBM

Inventor： KANEKO TOYOHISA ,  WATANUKI MASAAKI

IPC: G10L11/00 ,  G10L15/00 ,  G10L15/14 ,  G10L15/28

公开(公告)号：JPH07262750A

公开(公告)日：1995-10-13

申请号：JP4669794

申请日：1994-03-17

Applicant: IBM

Inventor： OTA SHUNICHIRO ,  KANAMARU MASAYUKI ,  WATANUKI MASAAKI

IPC: G11B17/32 ,  G11B23/50 ,  G11B25/04 ,  G11B33/14

Abstract: PURPOSE: To equaly and stably supply the suitable quantity of lubricant onto the surface of a magnetic disk for a long time by providing a clamp mechanism for fixing the disk to a spindle motor and a mechanism for fixing a lubricant containing member and a thin film while sandwiching them between the clamp mechanism and the magnetic disk. CONSTITUTION: This device has a lubricant containing member 14 for containing and holding certain quantity of lubricant suppliable onto a magnetic disk 10 for a long time, thin film 20 for supplying the prescribed quantity of lubricant onto the magnetic disk 10 while gradually making the lubricant permeable from this lubricant containing member 14, and clamp mechanism for fixing these lubricant containing member 14 and the thin film 20 together with the magnetic disk 10. The clamp mechanism has a clamp ring 16 and a screw mechanism 18, the thin film 20 is compressed by the screw mechanism 18, which is formed at the terminal part of the clamp mechanism, and fixed onto the magnetic disk 10 and corresponding to the quantity of this compression, the quantity of lubricant to be supplied onto the surface of the magnetic disk can be controlled.

公开(公告)号：JPH07230603A

公开(公告)日：1995-08-29

申请号：JP1840194

申请日：1994-02-15

Applicant: IBM

Inventor： WATANUKI MASAAKI ,  TSUJI SATOSHI ,  IKEDA YOSHIHIRO

IPC: G11B5/02 ,  G11B5/00 ,  G11B5/127 ,  G11B5/39 ,  G11B5/58 ,  G11B9/00 ,  G11B9/14

Abstract: PURPOSE: To improve a recording speed by recording a signal in a magnetic recording medium by a magnetic field generated from a chip according to the signal current by impressing a signal current to a coil. CONSTITUTION: The chip 11 is formed closely to the magnetic recording medium 12, and the coil 13 is formed on the medium 12. The chip 11 is connected with a rough adjusting mechanism 14 and a fine adjusting mechanism 15 to be position-controlled. The rough adjusting mechanism 14 is a voice motor, e.g. and as the fine adjusting mechanism 15, a piezo-element, etc., are used. An X-direction and Y-direction, namely directions parallel with the surface of the magnetic recording medium, are adjusted by the fine adjusting mechanism 15 connected to the chip, and a Z-direction vertical to the surface of the magnetic recording medium adjusted by a Z pizeo-element formed at the lower part of the medium. A piezo-driver 17 is connected to the Z element. The coil 13 is constituted of a lithograph on the medium 12, and this coil 13 switches the magnetic direction of the tip of the chip.