Abstract The epoxy/magnetite nanocomposites express superparamagnetism under a static or low-frequency electromagnetic field. At the microwave frequency, said X-band, reveal an unexpected diamagnetism. To explain intriguing phenomenon, we revisit Debye relaxation law with memory effect. magnetization vector of magnetite is unable to synchronize rapidly changing magnetic field, and it contribute...

Motivated by the strong constraints to noncommutative quantum theories coming from Gamma Ray Bursts and precision attained SQUID devices in measuring magnetic fields, we study this article thermodynamic behaviour of a Fermi gas subject action background field, two three dimensional space with coordinates momenta. An explicit expression is obtained for magnetization susceptibility gas, both Land...