國立高雄大學圖資館 |

Language: English

Back

Magnetocaloric Effect in Thin Films ...

Bauer, Christopher A.

Magnetocaloric Effect in Thin Films and Heterostructures.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Magnetocaloric Effect in Thin Films and Heterostructures.
Author:	Bauer, Christopher A.
Description:	97 p.
Notes:	Source: Masters Abstracts International, Volume: 50-01, page: 0469.
Notes:	Adviser: Casey W. Miller.
Contained By:	Masters Abstracts International50-01.
Subject:	Physics, Condensed Matter.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1497337
ISBN:	9781124802985

Magnetocaloric Effect in Thin Films and Heterostructures.
Bauer, Christopher A.

Magnetocaloric Effect in Thin Films and Heterostructures. - 97 p.

Source: Masters Abstracts International, Volume: 50-01, page: 0469.

Thesis (M.S.)--University of South Florida, 2011.

The goals of this work are the optimization of the magnetocaloric effect in Gadolinium thin film structures. We approach this issue from two directions, that of process optimization and of interface effects. Past results showed Gd2O3 in our Gadolinium thin films, and the presence of such oxide seemed to grow with the temperature at which the film was grown or annealed. Comparison of samples grown without chamber gettering to those that were gettered show differences in their structural and magnetic properties, and we conclude that gettering is an effective step in enhancing the quality of Gd thin film samples. Early work with Gd/W heterostructures showed a diminished magnetization of the interfacial gadolinium, which reduces the magnetocaloric response as magnetic entropy is proportional to m 2/3. It is known that Fe interfaces can boost the Gd moments per atom to above that seen in bulk. As such, we fabricated a series of Fe/Gd heterostructures to study the effects on the structural and magnetic properties of Gd thin films. The use of Fe as a base layer shows increased high frequency oscillations in X-ray reflectivity measurements, indicating sharp interfaces between Gd and Fe. The magnetocaloric measurements produce a magnetic entropy curve with a novel tail extending leftward, making this an improved material over Gd for applications around 240K. All the same, vector magnetometry is needed to ensure that such tail is not due to rotations within the plane and is a direction for further study.

ISBN: 9781124802985Subjects--Topical Terms:

226939
Physics, Condensed Matter.

Magnetocaloric Effect in Thin Films and Heterostructures.
LDR:02452nmm 2200289 4500 001 380710
005 20130530092741.5
008 130708s2011 ||||||||||||||||| ||eng d
020 $a 9781124802985
035 $a (UMI)AAI1497337
035 $a AAI1497337
040 $a UMI $c UMI
100 1 $a Bauer, Christopher A. $3 603343
245 1 0 $a Magnetocaloric Effect in Thin Films and Heterostructures.
300 $a 97 p.
500 $a Source: Masters Abstracts International, Volume: 50-01, page: 0469.
500 $a Adviser: Casey W. Miller.
502 $a Thesis (M.S.)--University of South Florida, 2011.
520 $a The goals of this work are the optimization of the magnetocaloric effect in Gadolinium thin film structures. We approach this issue from two directions, that of process optimization and of interface effects. Past results showed Gd2O3 in our Gadolinium thin films, and the presence of such oxide seemed to grow with the temperature at which the film was grown or annealed. Comparison of samples grown without chamber gettering to those that were gettered show differences in their structural and magnetic properties, and we conclude that gettering is an effective step in enhancing the quality of Gd thin film samples. Early work with Gd/W heterostructures showed a diminished magnetization of the interfacial gadolinium, which reduces the magnetocaloric response as magnetic entropy is proportional to m 2/3. It is known that Fe interfaces can boost the Gd moments per atom to above that seen in bulk. As such, we fabricated a series of Fe/Gd heterostructures to study the effects on the structural and magnetic properties of Gd thin films. The use of Fe as a base layer shows increased high frequency oscillations in X-ray reflectivity measurements, indicating sharp interfaces between Gd and Fe. The magnetocaloric measurements produce a magnetic entropy curve with a novel tail extending leftward, making this an improved material over Gd for applications around 240K. All the same, vector magnetometry is needed to ensure that such tail is not due to rotations within the plane and is a direction for further study.
590 $a School code: 0206.
650 4 $a Physics, Condensed Matter. $3 226939
690 $a 0611
710 2 $a University of South Florida. $b Physics. $3 603344
773 0 $t Masters Abstracts International $g 50-01.
790 1 0 $a Miller, Casey W., $e advisor
790 1 0 $a Hariharan, Srikanth $e committee member
790 1 0 $a Phan, Manh-Huong $e committee member
790 $a 0206
791 $a M.S.
792 $a 2011
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1497337