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Exploration of new multifunctional m...

Pathak, Arjun Kumar.

Exploration of new multifunctional magnetic materials based on a variety of Heusler alloys and rare-earth compounds.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Exploration of new multifunctional magnetic materials based on a variety of Heusler alloys and rare-earth compounds.
Author:	Pathak, Arjun Kumar.
Description:	208 p.
Notes:	Source: Dissertation Abstracts International, Volume: 72-09, Section: B, page: 5359.
Notes:	Adviser: Naushad Ali.
Contained By:	Dissertation Abstracts International72-09B.
Subject:	Physics, Condensed Matter.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3460324
ISBN:	9781124719702

Exploration of new multifunctional magnetic materials based on a variety of Heusler alloys and rare-earth compounds.
Pathak, Arjun Kumar.

Exploration of new multifunctional magnetic materials based on a variety of Heusler alloys and rare-earth compounds. - 208 p.

Source: Dissertation Abstracts International, Volume: 72-09, Section: B, page: 5359.

Thesis (Ph.D.)--Southern Illinois University at Carbondale, 2011.

Magnetic, magnetocaloric, magnetotransport and magnetoelastic properties of Ni-Mn-X (X = In, and Ga) Heusler alloys and La-Fe-Si based rare earth compounds have been synthesized and investigated by x-ray diffraction, magnetization, strain, and electrical resistivity measurements. The phase transitions, magnetic, magnetocaloric, magnetotransport and magnetoelastic properties strongly depend on the composition of these systems.

ISBN: 9781124719702Subjects--Topical Terms:

226939
Physics, Condensed Matter.

Exploration of new multifunctional magnetic materials based on a variety of Heusler alloys and rare-earth compounds.
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100 1 $a Pathak, Arjun Kumar. $3 603170
245 1 0 $a Exploration of new multifunctional magnetic materials based on a variety of Heusler alloys and rare-earth compounds.
300 $a 208 p.
500 $a Source: Dissertation Abstracts International, Volume: 72-09, Section: B, page: 5359.
500 $a Adviser: Naushad Ali.
502 $a Thesis (Ph.D.)--Southern Illinois University at Carbondale, 2011.
520 $a Magnetic, magnetocaloric, magnetotransport and magnetoelastic properties of Ni-Mn-X (X = In, and Ga) Heusler alloys and La-Fe-Si based rare earth compounds have been synthesized and investigated by x-ray diffraction, magnetization, strain, and electrical resistivity measurements. The phase transitions, magnetic, magnetocaloric, magnetotransport and magnetoelastic properties strongly depend on the composition of these systems.
520 $a In Ni50Mn50-xInx with x = 13.5, magnetocaloric and magnetotransport properties associated with the paramagnetic martensitic to paramagnetic austenitic transformation were studied. It was shown that magnetic entropy changes (DeltaSM) and magnetoresistance (MR) associated with this transformation are larger and the hysteresis effect is significantly lower when compared to that associated with paramagnetic-ferromagnetic transitions or ferromagnetic-antiferromagnetic/paramagnetic transitions in other systems. The Hall resistivity and the Hall angle shows unusual behavior in the vicinity of the martensitic phase transition for Ni50Mn 50-xInx with x = 15.2. The observed Hall resistivity and Hall angle are 50 &mgr;O·cm and tan-1 0.5, respectively. It was observed that the presence of Ge, Al and Si atoms on the In sites strongly affects the crystal structure, and the electric and magnetic behaviors of Ni50Mn35In15. It was found that the partial substitution of In atoms by Si in Ni50Mn35In15 results in an increase in the magnetocaloric effect, exchange bias and shape memory effect. In Ni50Mn35In15-xSi x, the peak values of positive DeltaSM for magnetic field changes H = 5 T were found to depend on composition and vary from 82 J·kg -1·K-1 for x = 1 (at T = 275 K) to 124 J·kg -1·K-1 for x = 3 (at T = 239 K). The partial substitution of Ni by Co in Ni50Mn35In15 significantly improves the magnetocaloric effect and MR in the vicinity of martensitic transition. In addition, significantly large inverse DeltaS M and MR were observed at the inverse martensitic phase transitions of the Ga-based magnetic shape memory Heusler alloys Ni50-xCo xMn32-yFeyGa18. The phase transition temperatures and magnetic properties were found to be correlated with the degree of tetragonal distortion in these samples.
520 $a In LaFe11.57Si1.43Bx the crystal cell parameters and Curie temperatures were found to increase linearly with increasing B concentration up to &sim; 0.1 % and 9 %, respectively. It was found that the characteristics of the magnetocaloric effect of LaFe11.57Si 1.43 can be adjusted by a change in B concentration in the LaFe 11.57Si1.43Bx system. A study of the influence of a small substitution of Ni, Cu, Cr, and V for Fe in LaFe11.4Si 1.6 revealed that the magnetic, magnetocaloric, and magnetovolume coupling constant is related to an increase in the average Fe-Fe interatomic distances, leading to a change in the d-d exchange interaction.
590 $a School code: 0209.
650 4 $a Physics, Condensed Matter. $3 226939
650 4 $a Engineering, Materials Science. $3 226940
690 $a 0611
690 $a 0794
710 2 $a Southern Illinois University at Carbondale. $b Physics. $3 603171
773 0 $t Dissertation Abstracts International $g 72-09B.
790 1 0 $a Ali, Naushad, $e advisor
790 1 0 $a Ali, Naushad $e committee member
790 1 0 $a Migone, Aldo $e committee member
790 1 0 $a Talapatra, Saikat $e committee member
790 1 0 $a Aouadi, Samir $e committee member
790 1 0 $a Don, Jarlen $e committee member
790 $a 0209
791 $a Ph.D.
792 $a 2011
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3460324