公开(公告)号：JPH0927112A

公开(公告)日：1997-01-28

申请号：JP7917696

申请日：1996-04-01

Applicant: BASF MAGNETICS GMBH

Inventor： HANSU YURUGEN RIHITAA ,  BUERUNAA RENTSU ,  RONARUDO JIYON BAICHI

IPC: C09D5/23 ,  G11B5/00 ,  G11B5/02 ,  G11B5/65 ,  G11B5/68 ,  G11B5/70 ,  G11B5/706

Abstract: PROBLEM TO BE SOLVED: To obtain a high recording density by setting the quotient of the residual deviation having Ir/(d.L)

公开(公告)号：JPH07165426A

公开(公告)日：1995-06-27

申请号：JP19303394

申请日：1994-08-17

Applicant: BASF MAGNETICS GMBH

Inventor： ETSUKEHARUTO SHIYUBUAPU ,  RONARUDO JIYON BAICHI ,  RAINHARUTO KERUNAA ,  EEMIIRU PUFUANEBETSUKAA ,  BERUNTO HEPUNAA

IPC: C01G49/00 ,  C09C1/24 ,  C09C3/06 ,  C09D5/23 ,  C09D7/12 ,  G11B5/706 ,  G11B5/84 ,  H01F1/11

公开(公告)号：JPH0944839A

公开(公告)日：1997-02-14

申请号：JP7917396

申请日：1996-04-01

Applicant: BASF MAGNETICS GMBH

Inventor： HANSU YURUGEN RIHITAA ,  BUERUNAA RENTSU ,  RONARUDO JIYON BAICHI

IPC: C09D5/23 ,  G11B5/00 ,  G11B5/02 ,  G11B5/09 ,  G11B5/68 ,  G11B5/738

Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording medium having high recording density. SOLUTION: It is found that when a magnetic recording medium for high- density recording has a small nonlinear strain, advantageous recording characteristics can be obtd. A magnetic recording medium having the following property will satisfy the requirement. The property is that, when square wave recording is performed and the recording current is controlled to the max. level of the principal wave of a square wave function at the wavelength corresponding three times as that of the electric head gap width gw , the medium has

公开(公告)号：JPH0927111A

公开(公告)日：1997-01-28

申请号：JP7917596

申请日：1996-04-01

Applicant: BASF MAGNETICS GMBH

Inventor： HANSU YURUGEN RIHITAA ,  BUERUNAA RENTSU ,  RONARUDO JIYON BAICHI

IPC: C09D5/23 ,  G11B5/00 ,  G11B5/02 ,  G11B5/09 ,  G11B5/68

Abstract: PROBLEM TO BE SOLVED: To obtain a recording medium having a high recording density by executing square wave recording in such a manner that the single phase deviating less than 5 deg. from the numerical value at which the phase of Fourier transform at the same wavelength is previously obtd. is measured in the case the square wave recording is executed. SOLUTION: The square wave signals having a frequency of 96kHz are recorded on a tape. These signals are then scanned by a digitizer read by a reading head. The pulses are obtd. by averaging the read pulses at the center. The average values of the 126 pulses in total number is obtd. In such a case, the phase response is (for example, about 5MHz) inclination 0 at the average frequency. The distinct comparison of different curves is thereby made possible.

公开(公告)号：JPH08321031A

公开(公告)日：1996-12-03

申请号：JP7917496

申请日：1996-04-01

Applicant: BASF MAGNETICS GMBH

Inventor： HANSU YURUGEN RIHITAA ,  BUERUNAA RENTSU ,  RONARUDO JIYON BAICHI

IPC: C09D5/23 ,  G11B5/68

Abstract: PROBLEM TO BE SOLVED: To obtain a magnetic recording medium having high recording density. SOLUTION: A magnetic recording medium intended for high recording density exhibits advantageous recording characteristics when it has a small nonlinear distortion. At the time of square wave recording, difference between an output level outT calculated after resetting a frequency response from single pulse measurement and an output level outF measured with same wavelength goes plus when a recording current is regulated to the maximum level of basic wave of square wave function having wavelength corresponding to three times of the gap width gW of an electrical head.

公开(公告)号：JPH07210857A

公开(公告)日：1995-08-11

申请号：JP28354294

申请日：1994-11-17

Applicant: BASF MAGNETICS GMBH

Inventor： HAARARUTO YAKOBU ,  RAINHARUTO KERUNAA ,  RONARUDO JIYON BAICHI ,  ETSUKEHARUTO SHIYUBUAPU ,  HERUMUUTO YAKUSHIYU ,  BERUNTO HEPUNAA ,  RUDEI REENERUTO ,  MANFUREETO OORINGAA

IPC: C01G37/027 ,  C09D5/23 ,  C09D7/12 ,  G11B5/706 ,  H01F1/11

Abstract: PURPOSE: To obtain a process for producing denatured chromium dioxide which exhibits a further narrow magnetic power distribution and coercive force distribution with respect to the prior art and, consequently, exhibits the coercive force of at least 40kA/m and thermal stability improved in magnetization as well. CONSTITUTION: This magnetic recording medium consists of a nonmagnetic substrate and at least one layer of magnetic layers which contain acicular CrO2 as the magnetic powder distributed uniformly in a polymer binder. The magnetic chromium dioxide is denatured by iron and tellurium or antimony and has the coercive force of at least 40kA/m, saturation magnetization of at least 85nTm /g and a specific surface area(SSA) of at least 25m /g. The decrease in the dependence of 50% in residual induction on temp. is resulted only at >=95 deg.C.