Researchers propose a method of magnetizing a material without applying an external magnetic field

Publicado em 29 julho 2021

Magnetizing a cloth with out making use of an exterior magnetic subject is proposed by researchers at São Paulo State College (UNESP), Brazil, in an article revealed within the journal Scientific Experiences, the place they element the experimental strategy used to realize this aim.

The research was a part of the Ph.D. analysis pursued by Lucas Squillante below the supervision of Mariano de Souza, a professor at UNESP’s Division of Physics in Rio Claro. Contributions have been additionally made by Isys Mello, one other Ph.D. candidate supervised by Souza, and Antonio Seridonio, a professor at UNESP’s Division of Physics and Chemistry in Ilha Solteira. The group was supported by FAPESP.

“Very briefly put, magnetization happens when a salt is compressed adiabatically, with out exchanging warmth with the exterior surroundings,” Souza instructed. “Compression raises the temperature of the salt and on the similar time rearranges its particles’ spins. In consequence, the full entropy of the system stays fixed and the system stays magnetized on the finish of the method.”

To assist perceive the phenomenon, it’s value recalling the fundamentals of spin and entropy.

Spin is a quantum property that makes elementary particles (quarks, electrons, photons, and so on.), compound particles (protons, neutrons, mesons, and so on.) and even atoms and molecules behave like tiny magnets, pointing north or south—up spin and down spin—when submitted to a magnetic subject.

“Paramagnetic supplies like aluminum, which is a steel, are magnetized solely when an exterior magnetic subject is utilized. Ferromagnetic supplies, together with iron, could show finite magnetization even within the absence of an utilized magnetic subject as a result of they’ve magnetic domains,” Souza defined.

Entropy is principally a measure of accessible configurations or states of the system. The better the variety of accessible states, the better the entropy. Austrian physicist Ludwig Boltzmann (1844-1906), utilizing a statistical strategy, related the entropy of a system, which is a macroscopic magnitude, with the variety of doable microscopic configurations that represent its macrostate. “Within the case of a paramagnetic materials, entropy embodies a distribution of possibilities that describes the variety of up spins or down spins within the particles it accommodates,” Souza mentioned.

Within the lately revealed research, a paramagnetic salt was compressed in a single path. “Utility of uniaxial stress reduces the amount of the salt. As a result of the method is performed with none change of warmth with the surroundings, compression produces an adiabatic rise within the temperature of the fabric. An increase in temperature means an increase in entropy. To maintain whole entropy within the system fixed, there have to be a element of native discount in entropy that offsets the rise in temperature. In consequence, the spins are likely to align, resulting in magnetization of the system,” Souza mentioned.

The overall entropy of the system stays fixed, and adiabatic compression ends in magnetization. “Experimentally, adiabatic compression is achieved when the pattern is compressed for much less time than is required for thermal rest—the everyday time taken by the system to change warmth with the surroundings,” Souza mentioned.

The researchers additionally suggest that the adiabatic rise in temperature may very well be used to research different interacting techniques, equivalent to Bose-Einstein condensates in magnetic insulators, and dipolar spin-ice techniques.

Extra info:

Lucas Squillante et al, Elastocaloric-effect-induced adiabatic magnetization in paramagnetic salts because of the mutual interactions, Scientific Experiences (2021). DOI: 10.1038/s41598-021-88778-4


Researchers suggest a technique of magnetizing a cloth with out making use of an exterior magnetic subject (2021, July 29)

retrieved 29 July 2021


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