Structural Properties of Anisotropic PtCo(001) and PtFe(001) Thin Films on MgO(001)

1993 ◽  
Vol 311 ◽  
Author(s):  
Bruce M. Lairson ◽  
Mark R. Visokay ◽  
Sean B. Brennan ◽  
Robert Sinclair ◽  
Bruce M. Clemens
Keyword(s):  
Structural Properties ◽  
Perpendicular Magnetic Anisotropy ◽  
Film Plane ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Axis Orientation ◽  
Superlattice Structure ◽  
Natural Superlattice ◽  
Epitaxial Multilayers ◽  
Magneto Optic

ABSTRACTWe report structural properties of PtFe and PtCo intermetallic compounds with perpendicular magnetic anisotropy and a preferred c-axis orientation perpendicular to the film plane, formed from initially epitaxial multilayers. These materials represent particular cases of a more general class of anisotropic magnetic compounds with the CuAu(1) natural superlattice structure. They possess high magneto-optic Kerr rotations and magnetizations, suggesting them as likely candidates for magneto-optic and perpendicular magnetic recording media.

Crystal Structure and Magnetic Properties of Co-Based Alloy Thin Film Prepared on Cr Underlayer With Good Crystallite Orientation

1991 ◽  
Vol 232 ◽  
Author(s):  
T. Kawanabe ◽  
J. G. Park ◽  
M. Naoe
Keyword(s):  
Thin Film ◽  
Crystal Orientation ◽  
Flat Surface ◽  
Film Plane ◽  
Recording Media ◽  
Alloy Thin Film ◽  
Crystallite Orientation ◽  
Axis Orientation ◽  
Glass Substrates ◽  
High Density Recording

ABSTRACTCo85Cr15-xTax(x:0, 2at%)/Cr films with microscopically flat surface were investigated for high density recording media. These films were deposited on silicon wafer and glass substrates at the substrate temperature Ts of 350 °C at argon pressure as low as sub-mTorr by using Facing Targets Sputtering (FTS) apparatus. The elevating of Ts promoted the Cr(200) orientation in film plane, leading to the in-plane c-axis orientation of Co crystallites. Addition of some elements such as Si, Ge and Ta in Cr thin film was found to stabilize Cr(110) crystal orientation even at Ts of 300 °C.

Magnetic and Magneto-Optic Properties of PtFe (001) and PtCo (001) Thin Films

1993 ◽  
Vol 313 ◽  
Author(s):  
Bruce M. Lairson ◽  
Mark R. Visokay ◽  
Robert Sinclair ◽  
Bruce M. Clemens
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Perpendicular Magnetic Anisotropy ◽  
Film Plane ◽  
Intermetallic Alloy ◽  
Face Centered Cubic ◽  
Visible Light Range ◽  
Face Centered ◽  
Co Alloys ◽  
Magneto Optic

ABSTRACTWe report on the magnetic and Magneto-optical properties of PtFe and PtCo intermetallic thin films when they have the CuAu(I) tetragonal structure and their crystallographic C axis is oriented out of the film plane. These films possess large perpendicular magnetic anisotropy energies. We observe changes in the Magneto-optic Kerr rotations of Pt-Fe and Pt-Co alloys associated with the formation of the uniaxial CuAu(I) crystal structure. In particular, we report the observation of up to 60% enhancement in the Magneto-optic Ken-rotation for ordered, epitaxial PtFe intermetallic alloy over that of the random face centered cubic alloy. This enhancement is wavelength dependent, with a peak in the visible light range at 2.0 eV.

Improvement of crystallographic characteristics of CoCrTa thin film using double underlayer

2001 ◽  
Vol 674 ◽  
Author(s):  
Y.J. Kim ◽  
S.H. Kong ◽  
S. Nakagawa ◽  
M. Naoe ◽  
K.H. Kim
Keyword(s):  
Thin Film ◽  
Magnetic Recording ◽  
Magnetic Layer ◽  
Recording Media ◽  
Interlayer Thickness ◽  
Magnetic Recording Media ◽  
Axis Orientation ◽  
Perpendicular Magnetic Recording ◽  
High Density Recording ◽  
Crystallographic Characteristics

ABSTRACTHigh c-axis oriented CoCr-based thin films are expected for ultra-high density recording media in perpendicular magnetic recording system. In order to improve dispersion angle of c-axis of CoCr-based for perpendicular magnetic recording media, we prepared trilayered film with double underlayer using New Facing Targets Sputtering apparatus. The thickness of magnetic layer CoCrTa and double underlayer, such as interlayer Pt, paramagnetic CoCr, underlayer Ti was fixed 50nm and 20nm respectively. In order to prepare the thin film, we fixed argon gas pressure 1mTorr, substrate temperature 250°C and input current 0.5A. The crystallographic characteristics of CoCrTa layer with varying interlayer thickness (0- 20nm) have been investigated. By the result, the CoCrTa trilayered thin film with interlayer Pt showed good c-axis orientation 3.45° and 3.62° at thickness 5nm and 10nm respectively. However, CoCrTa thin film using interlayer paramagnetic CoCr showed 8.28° and 8.62° at thickness 5nm and 10nm respectively.

Structural properties of polycrystalline Co–Cr–X (X=Pt and/or Ta)/Cr-alloy magnetic recording media

2000 ◽  
Vol 87 (9) ◽  
pp. 5699-5701 ◽  
Author(s):  
Yoshio Takahashi ◽  
Yusuke Yajima ◽  
Syuichi Kojima ◽  
Yuzuru Hosoe
Keyword(s):  
Structural Properties ◽  
Magnetic Recording ◽  
Recording Media ◽  
Magnetic Recording Media

Microstructure and magneto-optic properties of unannealed and annealed Fe/Pt and Co/Pt multilayers

1993 ◽  
Vol 51 ◽  
pp. 1042-1043
Author(s):  
Mark R. Visokay
Keyword(s):  
Thin Films ◽  
Film Plane ◽  
Ordered Structures ◽  
Perpendicular Magnetization ◽  
Transition Metal Alloys ◽  
Storage Media ◽  
Ordered Alloys ◽  
Epitaxial Multilayers ◽  
Seed Layers ◽  
Magneto Optic

Two requirements for magneto-optical storage media are remanent perpendicular magnetization and large magneto-optic Kerr rotations. Several film structures and material systems have been proposed for this purpose, including amorphous rare earth-transition metal alloys, Co/Pt multilayer films and Co/Pt alloys. Another structure that has potential for magneto-optic applications are thin films of ordered alloys based on the Llo structure, with two possible materials systems being Fe/Pt and Co/Pt. Ordered CoPt and FePt both adopt the Llo crystal structure, are ferromagnetic, and are magnetically easy along the unique axis. Thin films oriented such that the c axis is out of the film plane are expected to have large perpendicular anisotropy, and both FePt and CoPt are known to have large Ken-rotations, so both of the requirements mentioned above can be met with these materials.In order to produce the ordered structures oriented with the c axis out of the plane epitaxial multilayers of the two constituents were produced by magnetron sputtering onto epitaxial Pt [001] seed layers deposited onto MgO [001], resulting in multilayers stacked along Pt [001].

The Effect of Thickness on the Magnetic Anisotropy and Magnetic Properties of Single-Layered FePt Films by In Situ Annealing

2010 ◽  
Vol 123-125 ◽  
pp. 507-510
Author(s):  
S.C. Chen ◽  
T.H. Sun ◽  
C.L. Chang ◽  
Chih Long Shen ◽  
G.P. Lin ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Perpendicular Magnetic Anisotropy ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Fept Film ◽  
Perpendicular Magnetic Recording ◽  
High Density Recording

The FePt films with various thicknesses of 5 to 50 nm are deposited on Si(100) substrate without any underlayer by in-situ annealing at substrate temperature (Ts) of 620°C. A strong (001) texture of L10 FePt film is obtained and presents high perpendicular magnetic anisotropy as the film thickness increases to 30 nm. Further increasing the thickness to above 30 nm, the (111) orientation of L10 FePt is enhanced greatly, indicating that the quality of perpendicular magnetic anisotropy degrades when the FePt film is thicker than 30 nm. The single-layered FePt film with thickness of 30 nm by in-situ depositing at 620°C shows good perpendicular magnetic properties (perpendicular coercivity of 14.0 kOe, saturation magnetization of 473 emu/cm3 and perpendicular squareness of 0.96, respectively), which reveal its significant potential as perpendicular magnetic recording media for high-density recording.

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