Large Magnetization and Reversible Magnetocaloric Effect at the Second-Order Magnetic Transition in Heusler Materials

2016 ◽  
Vol 28 (17) ◽  
pp. 3321-3325 ◽  
Author(s):  
Sanjay Singh ◽  
Luana Caron ◽  
Sunil Wilfred D'Souza ◽  
Tina Fichtner ◽  
Giacomo Porcari ◽  
...  
Keyword(s):  
Magnetocaloric Effect ◽  
Magnetic Transition ◽  
Second Order

Tunable magnetocaloric effect in La0.7Ca0.3MnO3 nanoparticles

2018 ◽  
Vol 32 (26) ◽  
pp. 1850290
Author(s):  
S. Qaseem ◽  
M. Naeem ◽  
S. Rizwan Ali
Keyword(s):  
Particle Size ◽  
Magnetocaloric Effect ◽  
Magnetic Transition ◽  
Second Order ◽  
Gradual Transition ◽  
Cooling Power ◽  
Zero Field ◽  
Colossal Magnetoresistive ◽  
Three Samples ◽  
Saturation Region

We study ferromagnetic to paramagnetic transition using Banerjee criterion in colossal magnetoresistive La[Formula: see text]Ca[Formula: see text]MnO3 nanoparticles of different sizes (20, 26 and 32 nm). These particles are chemically prepared by a modified citrate route. Particle sizes are estimated by X-ray diffraction (XRD). Sample morphology and size distribution are examined by a transmission electron microscope. Order of transition is determined by measuring magnetic field dependence of magnetization near Curie temperature T[Formula: see text]. Our results reveal second-order magnetic transition in all three different-sized particles in contrast to the first-order transition reported in bulk samples. This is further supported by temperature dependences of zero-field-cooled (ZFC) and field-cooled (FC) magnetizations. FC curves show gradual transition for all three samples without any saturation region as is the case of bulk. T[Formula: see text] is extracted from ZFC curves and is found to be 240 K for 20 nm particles and 258 K for both 26 and 32 nm particles. Magnetocaloric effect as a function of particle size also confirms the second-order magnetic transition in all three samples. The relative cooling power at 20 kOe is found to be decreasing with decreasing particle size.

Magnetocaloric effect near the second order ferromagnetic transition in superstructure R15Si9C compounds (R=Gd, Tb and Dy)

2014 ◽  
Vol 588 ◽  
pp. 720-724 ◽  
Author(s):  
Amitava Bhattacharyya ◽  
A. Thamizhavel ◽  
S.K. Dhar ◽  
P. Manfrinetti
Keyword(s):  
Magnetocaloric Effect ◽  
Second Order ◽  
Ferromagnetic Transition

scholarly journals Magnetic transition and magnetocaloric effect of Gd4Sb3-xRx (R=Si, Ge, Sn, 0 ≤ x ≤ 0.75) compounds

AIP Advances ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 035206 ◽  
Author(s):  
Shaohui Chen ◽  
Guiquan Yao ◽  
Jinsong Zhang ◽  
Xiaomeng Fan ◽  
Xiaowei Yin ◽  
...  
Keyword(s):  
Magnetocaloric Effect ◽  
Magnetic Transition

Magnetic Phase Transitions and Magnetocaloric Effect in R2Fe17 (R = Y, Tb, Er)

2015 ◽  
Vol 233-234 ◽  
pp. 204-207 ◽  
Author(s):  
S.A. Nikitin ◽  
I.A. Ovchenkova ◽  
Georgiy A. Tskhadadze ◽  
Konstantin P. Skokov
Keyword(s):  
Transition Temperature ◽  
Magnetocaloric Effect ◽  
Magnetic Phase ◽  
Magnetic Transition ◽  
Exchange Interactions ◽  
Thermodynamic Theory ◽  
Magnetic Phase Transitions ◽  
Magnetic Transition Temperature ◽  
Local Fluctuations ◽  
Direct Measurements

The direct measurements of the magnetocaloric effect (MCE) and the magnetization for R2Fe17 (R = Y, Tb, Dy) compounds are reported. The maximal values of the MCE for different R2Fe17 compounds are almost the same at the Curie temperature and are equal to 0.8 – 0.85 K at ΛH = 13.5 kOe. The field dependencies of the magnetization and MCE and the dependence of MCE via magnetization deviates from the classical regularities and describes by the thermodynamic theory attracting the higher terms. Obviously the occurrence of the mixed exchange interactions in these compounds leads to the requirement of consideration both thermal and local fluctuations of the exchange integrals near the magnetic transition temperature.

Zero-thermal-hysteresis magnetocaloric effect induced by magnetic transition at a morphotropic phase boundary in Heusler Ni50Mn36Sb14−xInx alloys

2018 ◽  
Vol 20 (27) ◽  
pp. 18484-18490 ◽  
Author(s):  
Yin Zhang ◽  
Jieqiong Wang ◽  
Xiaoqin Ke ◽  
Tieyan Chang ◽  
Fanghua Tian ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Phase Boundary ◽  
Magnetocaloric Effect ◽  
Morphotropic Phase Boundary ◽  
Thermal Hysteresis ◽  
Magnetic Transition

Enhanced MCE with zero thermal hysteresis is achieved in Ni50Mn36Sb14−xInx by constructing a MPB-involved phase diagram.

scholarly journals Magnetocaloric effect and the change from first- to second-order magnetic phase transition in Pr0.7CaxSr0.3-xMnO3 polycrystalline compounds

AIP Advances ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 101417 ◽  
Author(s):  
Yen Pham ◽  
T. D. Thanh ◽  
T. V. Manh ◽  
N. T. Dung ◽  
W. H. Shon ◽  
...  
Keyword(s):  
Phase Transition ◽  
Magnetocaloric Effect ◽  
Magnetic Phase Transition ◽  
Magnetic Phase ◽  
Second Order ◽  
Order Magnetic Phase Transition
Sign in / Sign up

Export Citation Format

Share Document