Magnetization Processes and Eddy Currents in Iron Whiskers

1972 ◽  
Author(s):  
A. S. Arrott ◽  
B. Heinrich ◽  
D. S. Bloomberg
Keyword(s):  
Eddy Currents ◽  
Iron Whiskers ◽  
Magnetization Processes

Domain Configurations, Bloch Walls, and Magnetization Processes in Iron Whiskers from D.C. to 200 kHz. Theory and Experiment. I

1972 ◽  
Vol 50 (7) ◽  
pp. 710-720 ◽  
Author(s):  
B. Heinrich ◽  
A. S. Arrott
Keyword(s):  
Eddy Currents ◽  
Elastic Membrane ◽  
Magnetization Measurements ◽  
Wide Range ◽  
Elastic Wall ◽  
Iron Whiskers ◽  
Magnetization Processes ◽  
Theory And Experiment

Bloch walls in iron whiskers have been studied by direct magnetization measurements. Of several types of domain configurations the simplest, the Landau structure, is readily identified from the a.c. permeability. The behavior of this structure over a wide range of frequencies is accounted for by a model which treats the wall as an elastic membrane attached to two springs on its ends. The stiffness is shown to be magnetostatic in origin. The elastic wall is shown to be damped in its motion by eddy currents. The qualitative aspects of the behavior are well accounted for and some numerical consistencies are found.

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.

Magnetization processes of iron whiskers in small magnetic fields

1979 ◽  
Vol 20 (2) ◽  
pp. 159-161 ◽  
Author(s):  
H. H. Mende ◽  
Th. Kleinefeld
Keyword(s):  
Magnetic Fields ◽  
Iron Whiskers ◽  
Magnetization Processes

Domain Configurations, Bloch Walls and Magnetization Processes in Iron Whiskers from D.C. to 200 kHz. Theory and Experiment II

1973 ◽  
Author(s):  
A. S. Arrott ◽  
B. Heinrich ◽  
D. S. Bloomberg ◽  
Hugh C. Wolfe ◽  
C. D. Graham ◽  
...  
Keyword(s):  
Iron Whiskers ◽  
Magnetization Processes ◽  
Theory And Experiment

MAGNETIZATION PROCESSES IN HELICAL MnP

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

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

MAGNETIZATION PROCESSES IN MELT SPUN NdFeB-MAGNETS

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-655-C8-656 ◽  
Author(s):  
A. Handstein ◽  
J. Schneider ◽  
U. Heinecke ◽  
R. Grössinger ◽  
H. Sassik
Keyword(s):  
Ndfeb Magnets ◽  
Melt Spun ◽  
Magnetization Processes

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.

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