Back to Search
Start Over
Close-to-ideal spin polarization in zinc-doped Fe–Mo double perovskites at the nanoscale
- Source :
- Ceramics International, 48(1), 353-362. Elsevier Ltd
- Publication Year :
- 2022
- Publisher :
- Elsevier Ltd, 2022.
-
Abstract
- A high degree of spin polarization in half-metallic double perovskites is a prerequisite for several applications in spintronics, which depends crucially on the cationic order of the systems. This paper reports a study on tailoring the structure and morphology of nano-sized Sr2Fe1-xZnxMoO6 (x = 0.05, 0.1, 0.15) materials to improve their spin polarization. The combined analysis of synchrotron X-ray diffraction and magnetization data shows that Zn replaces Fe in the B sites. Although the majority of particles have lateral dimensions in the range 30–60 nm as observed by scanning electron microscope, the samples with x = 0.1 and 0.15 show finite-size effects with superparamagnetism below room temperature and a reduced Curie temperature (from 410 K for x = 0.05–390 K for x = 0.15). The results are due to the formation of networks of insulating Mo–O–Zn–O–Mo linkages and anti-phase boundaries, which divide the particles into smaller domains with a mean diameter of ∼11 nm as determined via a Langevin fit. The almost perfectly ordered structure in the nanodomains is responsible for a high magnetoresistance ratio. A value of -42% at 5 K in 50 kOe is recorded for the sample x = 0.15. Via fitting the magnetoresistance curve using the Inoue-Mekagawa theory, the spin polarization of 99% is determined.
- Subjects :
- Materials science
Condensed matter physics
Spintronics
Spin polarization
Magnetoresistance
Scanning electron microscope
Process Chemistry and Technology
Doping
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Magnetization
Materials Chemistry
Ceramics and Composites
Curie temperature
Superparamagnetism
Subjects
Details
- Language :
- English
- ISSN :
- 18733956 and 02728842
- Volume :
- 48
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Ceramics International
- Accession number :
- edsair.doi.dedup.....d2dbb26c7308b6184e8e9a7940a529d0