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Superspin glass aging behavior in textured and nontextured frozen ferrofluid
- Source :
- Journal of Applied Physics, MMM-Intermag Conference, MMM-Intermag Conference, Jan 2010, United States. pp.09E135, ⟨10.1063/1.3366615⟩
- Publication Year :
- 2010
-
Abstract
- The effect of magnetic anisotropy-axis alignment of individual nanoparticles on the collective aging behavior in the superspin glass state of a frozen ferrofluid has been investigated. The ferrofluid studied here consists of maghemite nanoparticles (γ-Fe2O3, mean diameter=8.6 nm) dispersed in glycerin at a volume fraction of ∼15%. The low temperature aging behavior has been explored through “zero-field cooled magnetization” (ZFCM) relaxation measurements using superconducting quantum interference device magnetometry. The ZFCM response functions were found to scale with effective age of the system in both textured and nontextured superspin glass states, but with markedly different scaling exponents, μ. The value of μ was found to shift from ∼0.9 in nontextured case to ∼0.6 in the textured case, despite the identical cooling protocol used in both experiments.
- Subjects :
- Ferrofluid
Materials science
Spin glass
Condensed matter physics
Relaxation (NMR)
FOS: Physical sciences
General Physics and Astronomy
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
75.75.-c, 75.30.Gw, 75.50.Tt
Condensed Matter - Other Condensed Matter
Magnetization
Magnetic anisotropy
Ferromagnetism
[PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other]
0103 physical sciences
Volume fraction
Magnetic nanoparticles
010306 general physics
0210 nano-technology
Other Condensed Matter (cond-mat.other)
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Journal of Applied Physics, MMM-Intermag Conference, MMM-Intermag Conference, Jan 2010, United States. pp.09E135, ⟨10.1063/1.3366615⟩
- Accession number :
- edsair.doi.dedup.....28e3cd0755de2fa2be888182978871c1
- Full Text :
- https://doi.org/10.1063/1.3366615⟩