The magnetic and magnetocaloric properties of Er-Co thin films fabricated by sputtering under an Ar pressure (PAr) varying from 2 to 10 mTorr in steps of 2 mTorr are investigated. The content of Co in the sputtered thin films decreases slightly as the PAr increases from 2 to 10 mTorr, resulting in a film composition varying from ErCo1.07 to ErCo0.93. Extensive changes in the magnetic and magnetocaloric properties are observed. As the PAr increases, the compensation temperature increases substantially from 83 to 141 K, as well as the temperature at which the maximum change in the magnetic entropy occurs, particularly in the low PAr range. Considering the small change observed in the composition of the thin films as a function of PAr, the changes in the magnetic and magnetocaloric properties are extensive, indicating that the PAr plays an important role in affecting the aforementioned properties in amorphous magnetic thin films.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) ( NRF-2014M3C1A8048841 ). MK and SHL wish to thank Mr. Seok Jin Yun for his help in the design of the alloys during the initial stage of the work.
© 2015 Elsevier B.V. All rights reserved.
- Ar pressure
- Er-Co alloys
- Magnetic properties
- Magnetocaloric effects
- Sputtered thin films
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering