Development of Co-alloys for perpendicular magnetic recording media

The objective of Co-alloy perpendicular media (PM) development is to achieve thermally stable media with enhanced SNR. This in turn requires advanced microstructural features and magnetic properties, such as excellent (00.2) orientation, narrow grain size distribution and small grain size, low fcc phase content and stacking faults (SFs), good chemical segregation at grain boundaries, high anisotropy (K/sub u/), high coercivity (H/sub c/), high negative nucleation field (H/sub n/), full squareness (S=M/sub T//M/sub S/) and optimized inter-granular exchange interaction. In this paper we discuss these important issues in the development of Co-alloy perpendicular media.

[1]  D. Weller,et al.  High anisotropy CoCrPt(B) media for perpendicular magnetic recording , 2003 .

[2]  S. Malhotra,et al.  Low-noise CoCrPtO perpendicular media with improved resolution , 2003 .

[3]  Randall H Victora,et al.  Areal density limits for perpendicular magnetic recording , 2002 .

[4]  Mourad Benakli,et al.  One terabit per square inch perpendicular recording conceptual design , 2002 .

[5]  Yoshio Takahashi,et al.  Stacking faults in Co–Cr–Pt perpendicular magnetic recording media , 2002 .

[6]  D. Weller,et al.  Study of stacking faults in Co-alloy perpendicular media , 2002 .

[7]  D. Weller,et al.  Development of CoX/Pd multilayer perpendicular magnetic recording media with granular seed layers , 2002 .

[8]  Hiroaki Muraoka,et al.  Realization of 52.5 Gb/in2 perpendicular recording , 2001 .

[9]  A. Kikukawa,et al.  CoCr-alloy perpendicular magnetic recording media for high-density recording , 2001 .

[10]  N. Honda,et al.  Preparation of Co–Cr–Pt alloy film with high perpendicular coercivity and large negative nucleation field , 2001 .

[11]  P. Rice,et al.  Medium noise and grain size analysis of CoCrPt/Ti perpendicular media with NiAl seed layer , 2001 .

[12]  T. Osaka,et al.  CoCrPtTa and Co/Pd perpendicular magnetic recording media with amorphous underlayers , 2001 .

[13]  C. Platt,et al.  Magnetic and structural properties of FeCoB thin films , 2001 .

[14]  H. Muraoka,et al.  Recording performance of CoCrPt-(Ta, B)/TiCr perpendicular recording media , 2001 .

[15]  N. Honda,et al.  Preparation of double layered perpendicular recording media with extremely high resolution , 2001 .

[16]  D. Litvinov,et al.  CoCrPtTa/Ti perpendicular media deposited at high sputtering rate , 2001 .

[17]  E. Fullerton,et al.  Growth, structural, and magnetic properties of high coercivity Co/Pt multilayers , 2001 .

[18]  D. Laughlin,et al.  Microstructure of Longitudinal Media , 2001 .

[19]  A. Kikukawa,et al.  Annealing effects on recording characteristics of CoCr-alloy perpendicular magnetic recording media , 2000 .

[20]  H. Muraoka,et al.  Effect of a Ti seed layer on the magnetic properties of CoCrTa double-layered perpendicular media , 2000 .

[21]  A. Kikukawa,et al.  Low noise performance of CoCrPt single-layer perpendicular magnetic recording media , 2000 .

[22]  B. Cord,et al.  Future media manufacturing-more than just conventional sputtering , 2000 .

[23]  Y. Ikeda,et al.  Composite perpendicular recording medium consisting of CoCrPt with large H/sub k/spl perp// and CoCr with positive inter-particle interaction , 1999 .

[24]  K. Kuga,et al.  Magnetic properties and recording characteristics of Co-Cr-Ta-Mo perpendicular recording media , 1999, IEEE International Magnetics Conference.

[25]  Y. Honda,et al.  Recording characteristics of single-layer perpendicular media using ring-shaped heads , 1999, IEEE International Magnetics Conference.

[26]  K. Ito,et al.  Remanent magnetization structures in single-layer perpendicular thin film media , 1999 .

[27]  Naoki Honda,et al.  Study on recording beyond 10 Gbit/in. 2 with Co-Cr based perpendicular recording media , 1999 .

[28]  T. Lee,et al.  Role of a paramagnetic amorphous CoZr seed layer in CoCrPt/Ti perpendicular recording media , 1999 .

[29]  K. Ito,et al.  Microscopic Magnetization Structures And Noise In Single-layer Perpendicular Thin Film Media , 1998, 7th Joint MMM-Intermag Conference. Abstracts (Cat. No.98CH36275).

[30]  N. Honda,et al.  Low Noise Co-Cr-Nb Perpendicular Recording Media With High Squareness , 1998, 7th Joint MMM-Intermag Conference. Abstracts (Cat. No.98CH36275).

[31]  Y. Ikeda,et al.  Ti underlayer effect on the recording characteristics of Co–Cr perpendicular media with weak and strong interparticle interactions , 1997 .

[32]  T. Toyooka,et al.  Novel Composite Perpendicular Recording Medium With Co/sub 78/Cr/sub22/ over Cr-Rich Co/sub 72/Cr/sub 28/ For Merged MR Heads , 1997, 1997 IEEE International Magnetics Conference (INTERMAG'97).

[33]  N. Honda,et al.  1.5 Gbit/in/sup 2/ Perpendicular Recording With Inductive Head , 1997, 1997 IEEE International Magnetics Conference (INTERMAG'97).

[34]  M. Abe,et al.  Sputter-deposition Of Co-Cr-Ta Alloy Layers On Ni-Zn Ferrite Plated Underlayers , 1997, 1997 IEEE International Magnetics Conference (INTERMAG'97).

[35]  Y. Ikeda,et al.  High Signal-to-noise Ratio Of A Cr-Rich CoCrPt Perpendicular Medium With A Large Medium Thickness , 1997, 1997 IEEE International Magnetics Conference (INTERMAG'97).

[36]  Y. Hirayama,et al.  Compositional microstructures of CoCr-alloy perpendicular magnetic recording media , 1996 .

[37]  Y. Honda,et al.  High density magnetic recording on highly oriented CoCr-alloy perpendicular rigid disk media , 1996 .

[38]  Kazufumi Ito,et al.  Development Of High Resolution And Low Noise Single-layered Perpendicular Recording Meidia For High Density Recording , 1996, Digests of the Magnetic Recording Conference 'Magnetic Recording Media'..

[39]  N. Honda,et al.  High recording performance of Co–Cr medium sputter‐deposited at high Ar pressure and high substrate temperature , 1996 .

[40]  Y. Hirayama,et al.  Improvement of Co71Cr19Pt10/Ti90Cr10 perpendicular recording media by independent optimization of film nucleation and growth processes , 1996 .

[41]  N. Honda,et al.  High coercivity in Co-Cr films for perpendicular recording prepared by low temperature sputter-deposition , 1994 .

[42]  N. Honda,et al.  Low‐temperature sputter deposition of high‐coercivity Co‐Cr films for perpendicular recording , 1994 .

[43]  P. Jang,et al.  Magnetic properties and structures of CoCrTa films for wide range of Cr variations , 1993 .

[44]  T. Yogi,et al.  Longitudinal media for 1 Gb/in/sup 2/ areal density , 1990, International Conference on Magnetics.

[45]  D. Mapps,et al.  Very thin CoCr films titanium underlayers for high-density perpendicularrecording computer discs , 1990, International Conference on Magnetics.

[46]  B. Demczyk,et al.  Magnetic-structural development in Co-Cr films for perpendicular recording media , 1988 .

[47]  U. Hwang,et al.  Magnetic properties and microstructure of Co-Cr-Pr vertically magnetized films , 1988 .

[48]  S. Yoshii,et al.  Co-Cr-W-C alloy thin films for perpendicular recording media , 1987 .

[49]  D. Mapps,et al.  The influence of nitrogen and other gases on the magnetic properties of bias-sputtered Co-Cr perpendicular films for computer memory applications , 1987 .

[50]  K. Ouchi,et al.  Recent subjects and progresses in research on Co-Cr perpendicular magnetic recording media , 1987 .

[51]  H. Masuya,et al.  Effect of addition of carbon on magnetic properties of sputter-deposited CoCr film , 1987 .

[52]  J. Artman,et al.  Magnetic anisotropy of Co-Cr thin films as a function of substrate temperature during deposition , 1987 .

[53]  D. Stevenson,et al.  Influence of deposition conditions on the properties of sputter‐deposited Co‐V thin films , 1987 .

[54]  W. Haines,et al.  Study of magnetic and recording properties of dc magnetron sputtered CoCr thin films , 1987 .

[55]  T. Suzuki,et al.  Magnetic properties and microstructure of sputtered Co-Cr films , 1987 .

[56]  Yukio Honda,et al.  Microstructure and magnetic properties of CoCr thin films formed on Ge layer , 1985 .

[57]  K. Ouchi,et al.  Properties of high rate sputtered perpendicular recording media , 1985 .

[58]  K. Ouchi,et al.  Co-Cr recording films with perpendicular magnetic anisotropy , 1978 .

[59]  Yoshihisa Nakamura,et al.  An analysis for the magnetization mode for high density magnetic recording , 1977 .

[60]  J. Thornton.  High Rate Thick Film Growth , 1977 .