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Finite-size scaling effect on Néel temperature of antiferromagneticCr2O3(0001) films in exchange-coupled heterostructures
- Source :
- Physical Review B. 94
- Publication Year :
- 2016
- Publisher :
- American Physical Society (APS), 2016.
-
Abstract
- The scaling of antiferromagnetic ordering temperature of corundum-type chromia films has been investigated. N\'eel temperature ${T}_{N}$ was determined from the effect of perpendicular exchange bias on the magnetization of a weakly-coupled adjacent ferromagnet. For a thick-film case, the validity of detection is confirmed by a susceptibility measurement. Detection of ${T}_{N}$ was possible down to 1-nm-thin chromia films. The scaling of ordering temperature with thickness was studied using different buffering materials and compared with Monte-Carlo simulations. The spin-correlation length and the corresponding critical exponent were estimated, and they were consistent between experimental and simulation results. The spin-correlation length is an order of magnitude less than cubic antiferromagnets. We propose that the difference is from the change of number of exchange-coupling links in the two crystal systems.
- Subjects :
- 010302 applied physics
Materials science
Condensed matter physics
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Chromia
Magnetization
Exchange bias
Ferromagnetism
0103 physical sciences
Antiferromagnetism
Condensed Matter::Strongly Correlated Electrons
0210 nano-technology
Scaling
Critical exponent
Néel temperature
Subjects
Details
- ISSN :
- 24699969 and 24699950
- Volume :
- 94
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi...........27fd9ddb302a4384aa5209f34f475964