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0 Ferromagnetism for Spintronics Application
Published in Ram K. Gupta, Sanjay R. Mishra, Tuan Anh Nguyen, Fundamentals of Low Dimensional Magnets, 2023
Ravi Trivedi, Brahmananda Chakroborty
Curie temperature relies upon doping fixation as well as on development conditions. Controlling the Curie temperature is undeniably challenging as prompted magnetic moment. Curie temperature is a lot of delicate to development conditions. The Curie temperature relies upon the magnetic minutes and material boundaries of the materials, like susceptibility, dipole minutes, penetrability, permittivity, and so forth. For handily shed van der Waals materials, feeble interlayer magnetic coupling brings about low Curie temperature regardless of whether the material is FM. When peeled from mass materials, more grounded intralayer couplings become predominant and Curie temperature can increase.
Introduction to Metallic Glasses
Published in Sumit Sharma, Metallic Glass–Based Nanocomposites, 2019
Curie temperature (TC), or Curie point, is the temperature above which certain materials lose their permanent magnetic properties. Normally, the Curie temperatures of metallic glasses are lower than that of their crystalline counterparts. It is believed that charge-transfer effects play an important role in this observation. These effects can increase the Curie temperature instead of decreasing it.
Transducers
Published in Anton F. P. van Putten, Electronic Measurement Systems, 2019
where M (A m−1 or A m2 m−3) is the total magnetic moment per unit volume, N (m−3) the total number of magnetic dipoles per unit volume, p (A m2) the magnetic dipole moment of the atom, μ0 (1.256 637 × 10−6 H m−1 or V s A−1 m−1) the permeability of vacuum, k the Boltzmann constant (1.38 × 10−23 J K−1) and T (K) the absolute temperature. This behaviour is illustrated in figure 6.26. Above a certain critical temperature, the so-called Curie temperature, ferromagnetism disappears and the material becomes paramagnetic.
Fast inductive curing of adhesively bonded glass-timber joints
Published in The Journal of Adhesion, 2022
Jonas Wirries, Michael Adam, Christian Tornow, Michael Noeske, Till Vallée, Morten Voß
To ensure heating of the adhesive via induction in the absence of metallic substrates, ferrite particles were added to the adhesive. These particles lose their permanent magnetic properties above specific temperatures (Curie temperature, TC). In this study, two types of particles were used: R12K (Hengdian Group DMEGC Magnetics Co., China), which labels Mn-Zn-ferrite particles that have their TC at >110°C. Additionally, magnetite (Fe3O4, Inoxia Ltd., UK) was added to some of the tested series to accelerate heating of the adhesive. Curie temperature of magnetite is around 580°C. The loss of the magnetic properties; and thus the Curie temperature was determined by thermogravimetric analysis (TGA) in an earlier publication by Valleé et al.[30] Particle size was determined by dynamic light scattering (DLS, Malvern Instruments, Inc., UK) resulting in predominant particle constituents at around 15 µm for R12K and 2 µm for Fe3O4.
Thermal-fluid and electromagnetic coupling analysis and test of a traction motor for electric vehicles
Published in Journal of the Chinese Institute of Engineers, 2018
Hao-Yen Howard Chang, Yee-Pien Yang, Frank Kou-Tzeng Lin
For electromagnetic devices, the main electrical and magnetic materials of a PM motor include copper wire, silicon steel, and a magnet, which all have temperature-dependent properties. For example, the resistance of copper wire becomes larger as its temperature increases. The magnet can lose its magnetism when its temperature exceeds the Curie temperature. The resistance of silicon steel is also altered by temperature; thereby affecting the resulting eddy current and the corresponding power loss. The temperature-dependent power loss causes the motor to heat up and its rising temperature in turn causes additional changes in the material properties, further altering the electromagnetic performance of the motor.