Multiplication of domain walls by eddy currents in nanocrystalline soft magnetic materials

2002 ◽  
Vol 242-245 ◽  
pp. 229-231 ◽  
Author(s):  
L. Fratila ◽  
O. Geoffroy ◽  
J.L. Porteseil
Keyword(s):  
Magnetic Materials ◽  
Eddy Currents ◽  
Domain Walls ◽  
Soft Magnetic Materials ◽  
Soft Magnetic

scholarly journals Effect of the Temperature on the Magnetic and Energetic Properties of Soft Magnetic Composite Materials

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4400
Author(s):  
Luca Ferraris ◽  
Fausto Franchini ◽  
Emir Pošković ◽  
Marco Actis Grande ◽  
Róbert Bidulský
Keyword(s):  
Magnetic Materials ◽  
Eddy Currents ◽  
Electrical Machines ◽  
Soft Magnetic Materials ◽  
Magnetic Composite ◽  
Soft Magnetic ◽  
Soft Magnetic Composite ◽  
Magnetic Performance ◽  
Magnetic Circuits ◽  
Energetic Characterization

In recent years, innovative magnetic materials have been introduced in the field of electrical machines. In the ambit of soft magnetic materials, laminated steels guarantee good robustness and high magnetic performance but, in some high-frequency applications, can be replaced by Soft Magnetic Composite (SMC) materials. SMC materials allow us to reduce the eddy currents and to design innovative 3D magnetic circuits. In general, SMCs are characterized at room temperature, but as electrical machines operate at high temperature (around 100 °C), an investigation analysis of the temperature effect has been carried out on these materials; in particular, three SMC samples with different binder percentages and process parameters have been considered for magnetic and energetic characterization.

Loss Separation Model: A Tool for Improvement of Soft Magnetic Materials

2016 ◽  
Vol 869 ◽  
pp. 596-601 ◽  
Author(s):  
Marcos Flavio de Campos
Keyword(s):  
Magnetic Material ◽  
Magnetic Materials ◽  
High Frequency ◽  
Eddy Currents ◽  
Soft Magnetic Materials ◽  
Barkhausen Noise ◽  
Magnetic Barkhausen Noise ◽  
Soft Magnetic ◽  
Physical Reasoning ◽  
Separation Model

Loss separation has fundamental importance for optimizing the magnetic material for a given frequency of operation. The loss separation model assumes the existence of two main terms: one due to the hysteresis at the quasi-static situation with frequency less than 0.01 Hz and another dynamic, due to high frequency eddy currents. In this study, it is discussed the physical reasoning behind the loss separation model. Magnetic Barkhausen Noise can be a valuable tool for better understanding the physics of loss separation.

A General Coercivity Model for Soft Magnetic Materials

2012 ◽  
Vol 727-728 ◽  
pp. 157-162 ◽  
Author(s):  
Marcos Flavio de Campos
Keyword(s):  
Grain Size ◽  
Energy Balance ◽  
Magnetic Materials ◽  
Domain Walls ◽  
Soft Magnetic Materials ◽  
Force Balance ◽  
Balance Model ◽  
Soft Magnetic ◽  
Crystalline Defects ◽  
Magnetostatic Energy

The effect of crystalline imperfections (as for instance, grain size, inclusions and dislocations) on the coercivity of soft magnetic materials is additive. This only can be explained by an Energy Balance Model. By another hand, the angular dependence of the coercivity only can be explained with a Force Balance Model. Thus both models, Energy Balance and Force Balance have to be invoked for the construction of a general model. The effect of dislocations on the coercivity can be treated as short range magnetostrictive effect. The effect of inclusions needs the consideration of the global magnetostatic energy of the system. The dependence of the coercivity with the grain size can also be explained analyzing the magnetostatic energy. The idea of pinning of domain walls by crystalline defects is reformulated, and it is shown that the coercivity increase due to crystalline defects is principally caused by variations of the magnetostatic energy in the system.

Advantages of CNT–MFM probes in observation of domain walls of soft magnetic materials

2007 ◽  
Vol 601 (22) ◽  
pp. 5289-5293 ◽  
Author(s):  
H. Kuramochi ◽  
T. Manago ◽  
D. Koltsov ◽  
M. Takenaka ◽  
M. Iitake ◽  
...  
Keyword(s):  
Magnetic Materials ◽  
Domain Walls ◽  
Soft Magnetic Materials ◽  
Soft Magnetic
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