Relaxation Times for Magnetization Reversal in a High Coercivity Magnetic Thin Film

1999 ◽  
Vol 83 (23) ◽  
pp. 4876-4879 ◽  
Author(s):  
N. D. Rizzo ◽  
T. J. Silva ◽  
A. B. Kos
Keyword(s):  
Thin Film ◽  
Magnetization Reversal ◽  
Relaxation Times ◽  
High Coercivity ◽  
Magnetic Thin Film

scholarly journals Achievement of high coercivity in Sm(Fe0.8Co0.2)12 anisotropic magnetic thin film by boron doping

2020 ◽  
Vol 194 ◽  
pp. 337-342 ◽  
Author(s):  
H. Sepehri-Amin ◽  
Y. Tamazawa ◽  
M. Kambayashi ◽  
G. Saito ◽  
Y.K. Takahashi ◽  
...  
Keyword(s):  
Thin Film ◽  
Boron Doping ◽  
High Coercivity ◽  
Magnetic Thin Film

CoPt/C NANOGRANULAR MAGNETIC THIN FILM

2005 ◽  
Vol 19 (14) ◽  
pp. 2261-2271 ◽  
Author(s):  
TONG LI ◽  
HUI YAN ◽  
HAI WANG ◽  
WU ZHENG
Keyword(s):  
Thin Film ◽  
Grain Size ◽  
Carbon Matrix ◽  
Magnetic Interactions ◽  
High Coercivity ◽  
Magnetic Thin Film ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Density Recording ◽  
Deposition Mode

Granular Co 30 Pt 70/ C and Co 45 Pt 55/ C films, consisting of nanoparticle CoPt phases embedded in a carbon matrix, have been made by co-sputtering from CoPt and C targets using a tandem deposition mode. X-ray diffraction shows the existence of hard CoPt phase embedded in an amorphous C matrix after annealing. The coercivities for CoPt/C are strongly dependent on C and Pt composition. Films with coercivity of up to 5.4 kOe and grain size of 7 nm can be obtained. The development of shoulder in hysteresis loop may be contributed to the co-existence of magnetic soft CoPt 3 and hard CoPt phases and the magnetic interactions between them. High remanence Mr/Ms (>0.8) found in our samples indicates the presence of the intergranular interactions in the samples. Observed positive contributions of δm also give evidence of the existence of exchange interaction. High coercivity and large Mr/Ms make granular CoPt/C film with magnetic nanoparticles very attractive for next-generation high-density recording.

Transmission Electron Microscopy of oriented Co84Cr14Ta2 thin films for longitudinal magnetic recording

1991 ◽  
Vol 49 ◽  
pp. 756-757
Author(s):  
T. P. Nolan
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Low Cost ◽  
Low Noise ◽  
Information Storage ◽  
High Coercivity ◽  
Magnetic Alloy ◽  
Magnetic Media ◽  
Transmission Electron

Thin film magnetic media are being used as low cost, high density forms of information storage. The development of this technology requires the study, at the sub-micron level, of morphological, crystallographic, and magnetic properties, throughout the depth of the deposited films. As the microstructure becomes increasingly fine, widi grain sizes approaching 100Å, the unique characterization capabilities of transmission electron microscopy (TEM) have become indispensable to the analysis of such thin film magnetic media.Films were deposited at 225°C, on two NiP plated Al substrates, one polished, and one circumferentially textured with a mean roughness of 55Å. Three layers, a 750Å chromium underlayer, a 600Å layer of magnetic alloy of composition Co84Cr14Ta2, and a 300Å amorphous carbon overcoat were then sputter deposited using a dc magnetron system at a power of 1kW, in a chamber evacuated below 10-6 torr and filled to 12μm Ar pressure. The textured medium is presently used in industry owing to its high coercivity, Hc, and relatively low noise. One important feature is that the coercivity in the circumferential read/write direction is significandy higher than that in the radial direction.

Measurement of Permeability Distribution of Magnetic Thin Film by Meander-Type Probe

2011 ◽  
Vol 131 (7) ◽  
pp. 511-516
Author(s):  
Junya Takahashi ◽  
Shin Yabukami ◽  
Tetsuya Ozawa ◽  
Yasunori Miyazawa ◽  
Kunio Yanagi ◽  
...  
Keyword(s):  
Thin Film ◽  
Magnetic Thin Film ◽  
Permeability Distribution
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