The origin of large overestimation of the magnetic entropy changes calculated directly by Maxwell relation

Weibin Cui; Wei Liu; Zhidong Zhang
May 2010
Applied Physics Letters;5/31/2010, Vol. 96 Issue 22, p222509
Academic Journal
By investigating the nature of the first-order magnetostructural phase transition, we point out the origin of large overestimation of magnetic entropy changes calculated by directly applying the Maxwell relation. Furthermore, if the mass variations in ferromagnetic and paramagnetic phases on temperature are taken into consideration in two-phase region, taking MnAsCx, (Mn, Al)As, and Mn0.994Fe0.004As compounds as example, based on the modified Maxwell relation, the large overestimation and discrepancy of magnetic entropy changes disappear. The magnetic entropy changes are equivalent with the values by Clausius–Claperyon equation, indicating the validity of this modified approach.


Related Articles

  • Universal behavior of CePd1− x Rh x ferromagnet at the quantum critical point. Shaginyan, V. R.; Popov, K. G.; Artamonov, S. A. // JETP Letters;Jun2007, Vol. 85 Issue 8, p398 

    The heavy-fermion metal CePd1− x Rh x can be tuned from ferromagnetism at x = 0 to the nonmagnetic state at some critical concentration x c . The non-Fermi liquid behavior (NFL) at x ≃ x c is recognized by the power-law dependence of the specific heat C( T) given by the...

  • The effect of Co doping on spin cluster resonance in the one-dimensional Ising ferromagnet FeTAC. Rubins, R. S.; Black, T. D.; Ravindran, K.; Drumheller, John E. // Journal of Applied Physics;5/15/1994, Vol. 75 Issue 10, p6081 

    Focuses on the electron paramagnetic resonance measurements made on a single crystal of the one-dimensional Ising ferromagnet [(CH[sub3])[sub3] NH] FeCl[sub3]-2H[sub2]0 or FeTAC containing a nominal ten percent of the isomorphous compound CoTAC. Differences observed in the two sets of spectra;...

  • Electron paramagnetic resonance study of honeybee Apis mellifera abdomens. Jaccoud El-Jaick, Léa; Acosta-Avalos, Daniel; Motta de Souza Esquivel, Darci; Wajnberg, Eliane; Paixão Linhares, Marilia // European Biophysics Journal;2001, Vol. 29 Issue 8, p579 

    Abstract Although ferromagnetic material has been detected in Apis mellifera abdomens and identified as suitable for magnetic reception, physical and magnetic properties of these particles are still lacking. Electron paramagnetic resonance is used to study different magnetic materials in these...

  • Spin dynamics studies of single Fe and Ni impurity in bcc iron (abstract). Sabiryanov, R.; Jawal, S.S. // Journal of Applied Physics;4/16/1997, Vol. 81 Issue 8, p3872 

    Presents an abstract of spin dynamic studies of single iron and nickel impurity in ferromagnetic bcc iron. Optimization of the magnetic structure; Pauli equation for noncollinear magnetic configuration; Effect of rotation from ferromagnetic ordering.

  • Magnetic Fields in Superconductors and Ferromagnetic Materials. Campbell, A. M. // Journal of Superconductivity & Novel Magnetism;Feb2011, Vol. 24 Issue 1/2, p895 

    comparison is made between the treatment of magnetic fields in superconductors and normal materials. First some history is given, showing how early workers anticipated vortices. Later treatments tried to build a macroscopic theory using forces and torques on magnets. This was extremely...

  • Magnetic transformation in Ni-Mn-In Heusler alloy. Kuzma, Marian; Maziarz, Wojciech; Stefaniuk, Ireneusz // Nukleonika;Jul2015, Vol. 60 Issue 3, p435 

    Magnetic properties of a Ni50Mn35.5In14.5 Heusler ribbon were studied by ferromagnetic resonance (FMR) in the temperature range of 335-100 K. In the temperature region of 265-170 K, the FMR signal disappeared, in spite of the fact that this region comprised the main crystal transformation...

  • Engineering spin propagation across a hybrid organic/inorganic interface using a polar layer. Schulz, L.; Nuccio, L.; Willis, M.; Desai, P.; Shakya, P.; Kreouzis, T.; Malik, V. K.; Bernhard, C.; Pratt, F. L.; Morley, N. A.; Suter, A.; Nieuwenhuys, G. J.; Prokscha, T.; Morenzoni, E.; Gillin, W. P.; Drew, A. J. // Nature Materials;Jan2011, Vol. 10 Issue 1, p39 

    Spintronics has shown a remarkable and rapid development, for example from the initial discovery of giant magnetoresistance in spin valves to their ubiquity in hard-disk read heads in a relatively short time. However, the ability to fully harness electron spin as another degree of freedom in...

  • On the experimental possibilities of observing single spins in a STM. Kozhushner, M. A.; Shub, B. R.; Muryasov, R. R. // JETP Letters;4/10/98, Vol. 67 Issue 7, p508 

    A method is proposed for observing the spins of individual particles by combining ESR and STM methods using a ferromagnetic needle or paramagnetic tip.

  • Electrical resistivity and enhanced magnetoresistance in (La... superlattices. Sahana, M.; Hegde, M. S. // Journal of Applied Physics;1/15/1999, Vol. 85 Issue 2, p1058 

    Presents information on a study which focused on the resistivity and magnetoresistance of ferromagnetic/paramagnetic oxide multilayers fabricated by pulsed laser deposition. Experimental details; Results and discussion; Conclusions.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics