scholarly journals Atomistic theory of thermally activated magnetization processes in Nd$_2$Fe$_{14}$B permanent magnet

2021 ◽  
Author(s):  
Seiji Miyashita ◽  
Masamichi Nishino ◽  
Yuta Toga ◽  
Taichi Hinokihara ◽  
Ismail Enes Uysal ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Thermally Activated ◽  
Magnetization Processes

Magnetic Aging

2005 ◽  
Vol 887 ◽  
Author(s):  
R. Skomski ◽  
J. Zhou ◽  
R. D. Kirby ◽  
D. J. Sellmyer
Keyword(s):  
Free Energy ◽  
Power Law ◽  
Magnetization Reversal ◽  
Eddy Currents ◽  
Scientific Research ◽  
Magnetization Dynamics ◽  
Energy Barriers ◽  
Thermally Activated ◽  
Magnetic Aging ◽  
Magnetization Processes

ABSTRACTThermally activated magnetization reversal is of great importance in areas such as permanent magnetism and magnetic recording. In spite of many decades of scientific research, the phenomenon of slow magnetization dynamics has remained partially controversial. It is now well-established that the main mechanism is thermally activated magnetization reversal, as contrasted to eddy currents and structural aging, but the identification of the involved energy barriers remains a challenge for many systems. Thermally activated slow magnetization processes proceed over energy barriers whose structure is determined by the micromagnetic free energy. This restricts the range of physically meaningful energy barriers. An analysis of the underlying micromagnetic free energy yields power-law dependences with exponents of 3/2 or 2 for physically reasonable models, in contrast to arbitrary exponents m and to 1/H-type laws.

scholarly journals Fast and Slow Magnetization Processes in Magnetic Recording Media

2005 ◽  
Vol 887 ◽  
Author(s):  
J. Zhou ◽  
R. Skomski ◽  
S. Michalski ◽  
R. D. Kirby ◽  
D. J. Sellmyer
Keyword(s):  
Magnetic Recording ◽  
Remanent Magnetization ◽  
Thermal Activation ◽  
Information Loss ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Local Anisotropy ◽  
Thermally Activated ◽  
Ultrahigh Density ◽  
Magnetization Processes

ABSTRACTInformation loss due to thermal activation is a major concern in ultrahigh-density magnetic recording media. The usually considered mechanism is thermally activated magnetization reversal over micromagnetic energy barriers. However, micromagnetic approaches ignore local anisotropy fluctuations, which translate into a time-dependent reduction of the remanent magnetization. The effect is negligibly small in macroscopic magnets but becomes important on a scale of a few nanometers.

Thermally activated flow of β-titanium and β-titanium-hydrogen alloys

2000 ◽  
Vol 80 (12) ◽  
pp. 2813-2825
Author(s):  
O. N. Senkov, J. J. Jonas, F. H. Froes
Keyword(s):  
Thermally Activated

MAGNETIZATION PROCESSES IN HELICAL MnP

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-972-C1-973
Author(s):  
T. NAGAMIYA ◽  
S. HIYAMIZU
Keyword(s):  
Magnetization Processes

NEW PERMANENT MAGNET DEVICES

1984 ◽  
Vol 45 (C1) ◽  
pp. C1-285-C1-291 ◽  
Author(s):  
R. Pauthenet
Keyword(s):  
Permanent Magnet

ANOMALOUS MAGNETIZATION PROCESSES AT LOW TEMPERATURES IN COMPOSITIONALLY MODULATED Co/Mn THIN FILMS

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1753-C8-1754
Author(s):  
H. Sakakima ◽  
M. Tessier ◽  
R. Krishnan ◽  
E. Hirota
Keyword(s):  
Thin Films ◽  
Low Temperatures ◽  
Magnetization Processes
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