Magnetic and recording characteristics of bicrystalline longitudinal recording medium formed on an MgO single crystal disk substrate

1994 ◽  
Vol 30 (6) ◽  
pp. 3975-3977 ◽  
Author(s):  
M. Futamoto ◽  
M. Suzuki ◽  
N. Inaba ◽  
A. Nakamura ◽  
Y. Honda
Keyword(s):  
Single Crystal ◽  
Recording Medium ◽  
Longitudinal Recording ◽  
Disk Substrate

Longitudinal recording performance of sputtered barium ferrite media on a carbon rigid disk substrate

1994 ◽  
Vol 30 (6) ◽  
pp. 4047-4049 ◽  
Author(s):  
S.S. Rosenblum ◽  
H. Hayashi ◽  
Jinshan Li ◽  
R. Sinclair
Keyword(s):  
Barium Ferrite ◽  
Rigid Disk ◽  
Longitudinal Recording ◽  
Disk Substrate

scholarly journals Three-dimensional erasable optical memory using a photochromic diarylethene single crystal as the recording medium

2001 ◽  
Vol 77 (2) ◽  
pp. 30-35 ◽  
Author(s):  
Tuyoshi FUKAMINATO ◽  
Seiya KOBATAKE ◽  
Tsuyoshi KAWAI ◽  
Masahiro IRIE
Keyword(s):  
Single Crystal ◽  
Three Dimensional ◽  
Optical Memory ◽  
Recording Medium

High-coercivity longitudinal recording medium prepared using non-heating process

2001 ◽  
Vol 37 (4) ◽  
pp. 1488-1490 ◽  
Author(s):  
H. Ohmori ◽  
A. Itoh ◽  
A. Maesaka ◽  
A. Okabe
Keyword(s):  
High Coercivity ◽  
Heating Process ◽  
Recording Medium ◽  
Longitudinal Recording

Microstructure and magnetic Structure of Co-based thin-film recording medium

1993 ◽  
Vol 51 ◽  
pp. 1012-1013
Author(s):  
M. Futamoto ◽  
Y. Honda ◽  
N. Inaba ◽  
Y. Matsuda ◽  
M. Suzuki
Keyword(s):  
Thin Film ◽  
Layered Medium ◽  
Average Distance ◽  
Magnetic Coupling ◽  
Film Plane ◽  
Recording Medium ◽  
Plan View ◽  
Sem Micrograph ◽  
Longitudinal Recording ◽  
The Relationship

Knowledge of the relationship between microstructure and microscopic magnetization configuration is strongly required to improve Co-based thin film media. The purpose of this paper is to report some of these properties measured for a thin film longitudinal recording medium and to discuss their inter-relationship.Figure 1 shows an SEM micrograph of fractured cross-section of CoCrPt/CoCrPtSi dual-layered medium which was used to demonstrate the feasibility of 2 Gb/in2 magnetic recording. The Cr underlayer is used to control the orientation, size, and distribution of magnetic crystals. Magnetic crystal grains, whose size ranges between 20-30nm, form chain-like clusters consisting of several crystals as shown in the plan-view TEM micrograph(Fig.2). Neighboring clusters are separated physically with an average distance of 3nm. Magnetic separation among magnetic crystals and/or clusters is important to reduce the medium noise which is related to magnetic coupling between crystals. The crystalline easy axes of the grains are randomly oriented in the film plane.

A Preparation of High Resolution Standards for Electron Microscopy. Part II

1971 ◽  
Vol 29 ◽  
pp. 160-161
Author(s):  
Akira Tanaka ◽  
David F. Harling
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Carbon Black ◽  
Single Crystal ◽  
Dark Field ◽  
Graphitized Carbon Black ◽  
Graphitized Carbon ◽  
Dark Field Imaging ◽  
Crystal Films ◽  
Micro Holes

In the previous paper, the author reported on a technique for preparing vapor-deposited single crystal films as high resolution standards for electron microscopy. The present paper is intended to describe the preparation of several high resolution standards for dark field microscopy and also to mention some results obtained from these studies. Three preparations were used initially: 1.) Graphitized carbon black, 2.) Epitaxially grown particles of different metals prepared by vapor deposition, and 3.) Particles grown epitaxially on the edge of micro-holes formed in a gold single crystal film.The authors successfully obtained dark field micrographs demonstrating the 3.4Å lattice spacing of graphitized carbon black and the Au single crystal (111) lattice of 2.35Å. The latter spacing is especially suitable for dark field imaging because of its preparation, as in 3.), above. After the deposited film of Au (001) orientation is prepared at 400°C the substrate temperature is raised, resulting in the formation of many square micro-holes caused by partial evaporation of the Au film.

Structure of Palladium Single-Crystal Films Prepared by Flash Evaporation onto (001) NaCl Substrates

1970 ◽  
Vol 28 ◽  
pp. 456-457
Author(s):  
L. E. Murr ◽  
G. Wong
Keyword(s):  
Single Crystal ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
High Rate ◽  
Flash Evaporation ◽  
Optimum Load ◽  
Single Crystal Films ◽  
Crystal Films ◽  
A Current

Palladium single-crystal films have been prepared by Matthews in ultra-high vacuum by evaporation onto (001) NaCl substrates cleaved in-situ, and maintained at ∼ 350° C. Murr has also produced large-grained and single-crystal Pd films by high-rate evaporation onto (001) NaCl air-cleaved substrates at 350°C. In the present work, very large (∼ 3cm2), continuous single-crystal films of Pd have been prepared by flash evaporation onto air-cleaved (001) NaCl substrates at temperatures at or below 250°C. Evaporation rates estimated to be ≧ 2000 Å/sec, were obtained by effectively short-circuiting 1 mil tungsten evaporation boats in a self-regulating system which maintained an optimum load current of approximately 90 amperes; corresponding to a current density through the boat of ∼ 4 × 104 amperes/cm2.

Dislocations, Ordering and Antiferromagnetic Domains in MnO

1970 ◽  
Vol 28 ◽  
pp. 522-523
Author(s):  
D. J. Barber ◽  
R. G. Evans
Keyword(s):  
Electron Diffraction ◽  
Single Crystal ◽  
Optical Microscopy ◽  
Defect Chemistry ◽  
Magnetic Structures ◽  
Optically Transparent ◽  
Magnetic Features ◽  
Antiferromagnetic Domains

Manganese (II) oxide, MnO, in common with CoO, NiO and FeO, possesses the NaCl structure and shows antiferromagnetism below its Neel point, Tn∼ 122 K. However, the defect chemistry of the four oxides is different and the magnetic structures are not identical. The non-stoichiometry in MnO2 small (∼2%) and below the Tn the spins lie in (111) planes. Previous work reported observations of magnetic features in CoO and NiO. The aim of our work was to find explanations for certain resonance results on antiferromagnetic MnO.Foils of single crystal MnO were prepared from shaped discs by dissolution in a mixture of HCl and HNO3. Optical microscopy revealed that the etch-pitted foils contained cruciform-shaped precipitates, often thick and proud of the surface but red-colored when optically transparent (MnO is green). Electron diffraction and probe microanalysis indicated that the precipitates were Mn2O3, in contrast with recent findings of Co3O4 in CoO.

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