Evolution of magnetization reversal on patterned magnetic elements

2000 ◽  
Vol 36 (5) ◽  
pp. 2978-2980 ◽  
Author(s):  
J.C. Wu ◽  
H.W. Huang ◽  
Te-Ho Wu
Keyword(s):  
Magnetization Reversal ◽  
Magnetic Elements

scholarly journals Electron Holography of Nanostructured Magnetic Materials

1999 ◽  
Vol 589 ◽  
Author(s):  
R. E. Dunin-Borkowski ◽  
B. Kardynal ◽  
M. R. Mccartney ◽  
M. R. Scheinfein ◽  
David J. Smith
Keyword(s):  
Magnetic Materials ◽  
Magnetization Reversal ◽  
Electron Holography ◽  
Magnetic Elements

AbstractOff-axis electron holography and micromagnetic calculations that involve solutions to the Landau-Lifshitz-Gilbert equations are used to study magnetization reversal processes in lithographically patterned submicron-sized Co and Co/Au/Ni magnetic elements.

Influence of magnetostatic interactions on the magnetization reversal of patterned magnetic elements

2011 ◽  
Vol 109 (7) ◽  
pp. 07D354 ◽  
Author(s):  
Xioalu Yin ◽  
S. H. Liou ◽  
A. O. Adeyeye ◽  
S. Jain ◽  
Baoshan Han
Keyword(s):  
Magnetization Reversal ◽  
Magnetic Elements ◽  
Magnetostatic Interactions

scholarly journals Micromagnetism and magnetization reversal of micron-scale (110) Fe thin-film magnetic elements

1999 ◽  
Vol 60 (10) ◽  
pp. 7352-7358 ◽  
Author(s):  
J. Yu ◽  
U. Rüdiger ◽  
A. D. Kent ◽  
L. Thomas ◽  
S. S. P. Parkin
Keyword(s):  
Thin Film ◽  
Magnetization Reversal ◽  
Magnetic Elements

Determination of eddy current losses and hysteresis losses in magnetic circuits of electrical machines

2020 ◽  
pp. 54-58
Author(s):  
S. M. Plotnikov
Keyword(s):  
Eddy Current ◽  
Magnetization Reversal ◽  
Eddy Currents ◽  
Technical Problem ◽  
Electrical Machines ◽  
Eddy Current Losses ◽  
Hysteresis Losses ◽  
Magnetic Circuits ◽  
Core Losses ◽  
Reversal Frequency

The division of the total core losses in the electrical steel of the magnetic circuit into two components – losses dueto hysteresis and eddy currents – is a serious technical problem, the solution of which will effectively design and construct electrical machines with magnetic circuits having low magnetic losses. In this regard, an important parameter is the exponent α, with which the frequency of magnetization reversal is included in the total losses in steel. Theoretically, this indicator can take values from 1 to 2. Most authors take α equal to 1.3, which corresponds to the special case when the eddy current losses are three times higher than the hysteresis losses. In fact, for modern electrical steels, the opposite is true. To refine the index α, an attempt was made to separate the total core losses on the basis that the hysteresis component is proportional to the first degree of the magnetization reversal frequency, and the eddy current component is proportional to the second degree. In the article, the calculation formulas of these components are obtained, containing the values of the total losses measured in idling experiments at two different frequencies, and the ratio of these frequencies. It is shown that the rational frequency ratio is within 1.2. Presented the graphs and expressions to determine the exponent α depending on the measured no-load losses and the frequency of magnetization reversal.

Magnetic Aftereffect and Magnetization Reversal of Sr-Ferrite Fine Particles.

1994 ◽  
Vol 18 (2) ◽  
pp. 193-196 ◽  
Author(s):  
H. Nishio ◽  
H. Taguchi ◽  
F. Hirata ◽  
T. Takeishi
Keyword(s):  
Magnetization Reversal ◽  
Fine Particles ◽  
Magnetic Aftereffect

COMPUTER SIMULATIONS OF MAGNETIZATION REVERSAL DYNAMICS

1993 ◽  
Vol 17 (S_1_MORIS_92) ◽  
pp. S1_255-257 ◽  
Author(s):  
Roscoe C. Giles ◽  
Masud Mansuripur
Keyword(s):  
Computer Simulations ◽  
Magnetization Reversal

Magnetization dynamics of irradiation-fabricated perpendicularly magnetized dots inside a softer magnetic matrix

2003 ◽  
Vol 777 ◽  
Author(s):  
T. Devolder ◽  
M. Belmeguenai ◽  
C. Chappert ◽  
H. Bernas ◽  
Y. Suzuki
Keyword(s):  
Domain Wall ◽  
Magnetic Anisotropy ◽  
Magnetization Reversal ◽  
Ion Irradiation ◽  
Magnetic Nanostructures ◽  
Magnetic Storage ◽  
Exchange Field ◽  
Static Magnetization ◽  
Specific Domain ◽  
Helium Ion

AbstractGlobal Helium ion irradiation can tune the magnetic properties of thin films, notably their magneto-crystalline anisotropy. Helium ion irradiation through nanofabricated masks can been used to produce sub-micron planar magnetic nanostructures of various types. Among these, perpendicularly magnetized dots in a matrix of weaker magnetic anisotropy are of special interest because their quasi-static magnetization reversal is nucleation-free and proceeds by a very specific domain wall injection from the magnetically “soft” matrix, which acts as a domain wall reservoir for the “hard” dot. This guarantees a remarkably weak coercivity dispersion. This new type of irradiation-fabricated magnetic device can also be designed to achieve high magnetic switching speeds, typically below 100 ps at a moderate applied field cost. The speed is obtained through the use of a very high effective magnetic field, and high resulting precession frequencies. During magnetization reversal, the effective field incorporates a significant exchange field, storing energy in the form of a domain wall surrounding a high magnetic anisotropy nanostructure's region of interest. The exchange field accelerates the reversal and lowers the cost in reversal field. Promising applications to magnetic storage are anticipated.

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