Spin glass or random anisotropy?: The origin of magnetically glassy behavior in nanostructured GdAl{sub 2}
Initially crystalline GdAl{sub 2} was mechanically milled for long times to produce a highly chemically disordered phase with approximately 8-nm grains. Analysis of dc magnetization measurements using an Arrott plot and the approach to saturation suggest the presence of significant random anisotropy...
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| Veröffentlicht in: | Journal of applied physics 2005-05, Vol.97 (10) |
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| container_title | Journal of applied physics |
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| creator | Shand, P.M. Stark, C.C. Williams, D. Morales, M.A. Pekarek, T.M. Leslie-Pelecky, D.L. Department of Physics and Astronomy and Center for Materials Research and Analysis, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0111 Department of Chemistry and Physics, University of North Florida, 4567 St. John's Bluff Road South, Jacksonville, Florida 32224 Department of Physics and Astronomy and Center for Materials Research and Analysis, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0111 |
| description | Initially crystalline GdAl{sub 2} was mechanically milled for long times to produce a highly chemically disordered phase with approximately 8-nm grains. Analysis of dc magnetization measurements using an Arrott plot and the approach to saturation suggest the presence of significant random anisotropy. ac susceptibility measurements showed that the shift in the peak temperature with frequency usually seen in magnetically glassy and superparamagnetic systems was virtually undetectable in the 10-1000-Hz frequency range. Based on these results, we believe that this material represents an interacting system with random anisotropy, where the anisotropy is the result of surface and interface asymmetries. |
| doi_str_mv | 10.1063/1.1853003 |
| format | Article |
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Analysis of dc magnetization measurements using an Arrott plot and the approach to saturation suggest the presence of significant random anisotropy. ac susceptibility measurements showed that the shift in the peak temperature with frequency usually seen in magnetically glassy and superparamagnetic systems was virtually undetectable in the 10-1000-Hz frequency range. 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Analysis of dc magnetization measurements using an Arrott plot and the approach to saturation suggest the presence of significant random anisotropy. ac susceptibility measurements showed that the shift in the peak temperature with frequency usually seen in magnetically glassy and superparamagnetic systems was virtually undetectable in the 10-1000-Hz frequency range. 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Analysis of dc magnetization measurements using an Arrott plot and the approach to saturation suggest the presence of significant random anisotropy. ac susceptibility measurements showed that the shift in the peak temperature with frequency usually seen in magnetically glassy and superparamagnetic systems was virtually undetectable in the 10-1000-Hz frequency range. Based on these results, we believe that this material represents an interacting system with random anisotropy, where the anisotropy is the result of surface and interface asymmetries.</abstract><cop>United States</cop><doi>10.1063/1.1853003</doi></addata></record> |
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| source | AIP Journals Complete; AIP Digital Archive |
| subjects | ALUMINIUM ALLOYS ANISOTROPY ASYMMETRY FERROMAGNETIC MATERIALS GADOLINIUM ALLOYS HZ RANGE INTERFACES MAGNETIC SUSCEPTIBILITY MAGNETIZATION MATERIALS SCIENCE METALLIC GLASSES MILLING NANOSTRUCTURES RANDOMNESS SPIN GLASS STATE SUPERPARAMAGNETISM |
| title | Spin glass or random anisotropy?: The origin of magnetically glassy behavior in nanostructured GdAl{sub 2} |
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