All issues
Predecessor
24.32
Displaying 1-11 of 11 articles from this issue
- |<
- <
- 1
- >
- >|
-
Article type: Cover
Pages Cover1-
Published: June 08, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (14K) -
Article type: Index
Pages Toc1-
Published: June 08, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (44K) -
Akihiko Takeo, Soichi Oikawa, Takashi Hikosaka, Yoichiro TanakaArticle type: Article
Session ID: MMS2000-1
Published: June 08, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSPerpendicular recording is expected as high areal density recording system because of strong thermal stability potential and highly efficient writing process. However, large demagnetizing fields in uniformly magnetized areas cause recording demagnetization and signal decrease with time. High nucleation field media can suppress these demagnetization problems. CoPtCrO perpendicular medium with high nucleation field successfully demonstrated the low noise performance. It shows less recording demagnetization and strong thermal stability. CoPtCrO perpendicular medium exhibited good BER performance with ring head recording.View full abstractDownload PDF (781K) -
T. Shimatsu, I. Watanabe, H. Muraoka, Y. Sugita, Y. NakamuraArticle type: Article
Session ID: MMS2000-2
Published: June 08, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe effect of thermal agitation of magnetization on the magnetic properties of granular (CoCrTa/Ti) perpendicular media was studied by using a pulse magnetometer. The values of the "intrinsic" remanence coercivity H_0, obtained by subtracting the thermal agitation of magnetization, gradually approaches magnetocrystalline anisotropy field of grains H_k as the CoCrTa thickness decreases. The H_0 shows values larger than 90% of H_k at thicknesses of less than 20nm. The activation volume gradually decreases as the thickness decreases, and is nearly the same as the mean grain volume at thickness of less than 30nm. This suggests that magnetization reversal within the grains is uniform at thicknesses of less than 30nm.View full abstractDownload PDF (663K) -
Kaori TAGUCHI, Kiyoshi YAMAKAWA, Naoki HONDA, Kazuhiro OUCHIArticle type: Article
Session ID: MMS2000-3
Published: June 08, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe investigated the effect of erased magnetization of the medium on the recorded patterns for a FIB-trimmed narrow tracwidth single pole head. MFM images of the recorded patterns of the double-layered medium written on the different erased states were observed. The difference of widths of the recorded bits between polarities of magnetization was suppressed for the ac-erased state compared with the dc-erased state. This is because of the little influence of the field from the adjacent magnetization of the recorded track on the head field for the ac-erased state. It is expected the higher track density could be achieved for the ac-erased state because of effectively wide read width for a given trakwidth in the wide write-narrow read system.View full abstractDownload PDF (993K) -
H. Katada, T. Shimatsu, I. Watanabe, H. Muraoka, Y. Nakamura, Y. Sugit ...Article type: Article
Session ID: MMS2000-4
Published: June 08, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe induced anisotropy field H_k of thin permalloy(77〜81at%Ni concentration) and CoZrNb amorphous films was investigated. The value of the H_k of these films was found to decrease as the film thickness decreases below 20nm. The value of H_k at 3nm was found to be nearly half that at 20nm. A similar reduction of H_k was observed at 77K. On the other hand, the easy axis of the Ni_<79>Fe_<21> films thinner than 5nm was switched to the field direction by annealing with a magnetic field perpendicular to the easy axis of the as-deposited films, even at a low annealing temperature of 160℃.View full abstractDownload PDF (683K) -
Toshiaki KEITOKU, Jun ARIAKE, Naoki HONDA, Kazuhiro OUCHIArticle type: Article
Session ID: MMS2000-5
Published: June 08, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSMagnetic properties of Co-Cr-Pt thin films for perpendicular magnetic recording media were studied in terms of film composition. Relatively high perpendicular coercivity(Hc_<⊥>) greater than 5000 Oe was obtained at 13-18 at% Cr content and 14-21 at% Pt content. Perpendicular squareness (SQ_<⊥>) and the maximum absolute value of the nucleation field (H_N) were equal to unity and 2500 Oe, respectively. Magnetic anisotropy field (Hk) greater than 10 kOe for Co-Cr-Pt films also was obtained for both Cr and Pt contents of 12-24 at%, preferably for reducing thermal relaxation and medium noise of future high density recording.View full abstractDownload PDF (846K) -
Takashi Komakine, Naoki Honda, Kazuhiro OuchiArticle type: Article
Session ID: MMS2000-6
Published: June 08, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDouble-layered perpendicular recording media had two dominant medium noises, a transition jitter noise and a reversed domain noise. The transition jitter noise spectrum was delivered from the derivative of the transition shape, while the reversed domain noise spectrum was derived from the impulsive reversed domain. The noise enhancement in a low frequency region with increasing the recording density was caused by the jitter noise. The noise spectra from both origins should be whitened when the transition width and the reversed domain size became small. In the case, the noise spectrum was controlled by the channel characteristic including the head response, and the noise enhancement in a low frequency region by the jitter disappeared.View full abstractDownload PDF (642K) -
Ryuji SUGITA, Osamu SAITO, Takahiro KINOSHITA, Tetsuo MURANOIArticle type: Article
Session ID: MMS2000-7
Published: June 08, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA magnetic contact duplication technique using lithographically patterned master meida is investigated in order to write a servo signal on hard disks and floppy disks at a high speed and alow cost. In this technique, the coercivity of the master media is low, and dc magnetic field is appied to a slave medium contacted with the master one. A computer simulation using finite element method shows that the pattern of the master medium can be duplicated on a slave one. The possibility of duplication by using this technique is confirmed from experimetal results in which a Bitter pattern of a duplicated slave medium is clearly observed.View full abstractDownload PDF (709K) -
Article type: Appendix
Pages App1-
Published: June 08, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (88K) -
Article type: Cover
Pages Cover2-
Published: June 08, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (63K)
- |<
- <
- 1
- >
- >|