Giant magnetoresistance and superparamagnetism in Dy{sub x}Fe{sub 100-x} nanogranular magnetic thin films at room temperature

Journal Article · Fri May 06 00:00:00 EDT 2016 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4946378· OSTI ID:22606443

Mekala, Laxman; Shameem, Muhammed P.V.; Singh, Dushyanth

In this article, Dy{sub x}Fe{sub 100-x} nanogranular (15 ≤ x ≤ 25) thin films have been prepared at ambient temperature by dc magnetron sputtering. The correlation between the microstructure, magneto transport and magnetization properties is discussed. The grain size of Dy (Dysprosium) and Fe (Iron) was measured to be about 2 to 3 nm, respectively and the distribution of grains was homogenous throughout the sample. The magnetoresistance is sensitive to microstructural changes (particle size as well as Dy concentration). At the room temperature, the magnetoresistance [MR %] increased from 0.2 to 2.2 with increase in atomic concentration of Dy from x = 15 to 25 and we obtained maximum 2.2 MR [%] for x = 25 in this series of samples. The magnetization studies have revealed that all the samples are superparamagnetic (SPM) at room temperature.

• OSTI ID: 22606443
• Journal Information: AIP Conference Proceedings, Vol. 1728, Issue 1; Conference: ICC 2015: International conference on condensed matter and applied physics, Bikaner (India), 30-31 Oct 2015; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMBIENT TEMPERATURE
CONCENTRATION RATIO
CORRELATIONS
DISTRIBUTION
DYSPROSIUM COMPOUNDS
GRAIN SIZE
IRON COMPOUNDS
MAGNETIZATION
MAGNETORESISTANCE
MAGNETRONS
NANOSTRUCTURES
PARTICLE SIZE
SPUTTERING
SUPERPARAMAGNETISM
TEMPERATURE RANGE 0273-0400 K
THIN FILMS