Structure-independent universality of Barkhausen criticality in iron nitride thin films
| Autor: | Shahid Atiq, Saadat Anwar Siddiqi, M. Sabieh Anwar, Sung-Chul Shin, Hun-Sung Lee |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
Magnetic domain Condensed matter physics Critical phenomena General Chemistry Condensed Matter Physics Universality (dynamical systems) symbols.namesake Iron nitride chemistry.chemical_compound Ferromagnetism chemistry Materials Chemistry symbols Barkhausen stability criterion Critical exponent Barkhausen effect |
| Zdroj: | Solid State Communications. 150:1169-1172 |
| ISSN: | 0038-1098 |
| DOI: | 10.1016/j.ssc.2010.04.022 |
| Popis: | Discrete and jerky jumps during the process of magnetization reversal in ferromagnetic systems cause Barkhausen intermittency. We have investigated critical scaling behavior of the Barkhausen avalanche of 2-dimensional γ-Fe4N thin films using a magneto-optic microscope magnetometer (MOMM) capable of time-resolved magnetic domain images. A statistical analysis of the fluctuating size of Barkhausen jumps from numerous repetitive experiments shows a power-law scaling behavior in the ferromagnetic iron nitride system exhibiting a critical exponent value of τ = 1.02 within the experimental error. The value of critical exponent is found to manifest universality irrespective of the degree of texture of the film induced by annealing temperature. |
| Databáze: | OpenAIRE |
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