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Quantitative Scaling of Magnetic Avalanches
G Durin1,2, F Bohn3, M A Corrêa3
1Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce 91, 10135 Torino, Italy.
Physical Review Letters
|September 3, 2016
Summary
This study compares Barkhausen noise experiments with avalanche theory for magnetic materials. Results show good agreement for samples without eddy currents, validating theories beyond mean field.
Area of Science:
- Condensed matter physics
- Materials science
- Statistical mechanics
Background:
- Barkhausen noise is a critical phenomenon in magnetic materials.
- Avalanche theory describes phenomena involving abrupt changes in systems.
- Pinned interfaces in magnetic materials exhibit complex behavior.
Purpose of the Study:
- To quantitatively compare Barkhausen noise experiments with avalanche theory predictions.
- To test avalanche theory both in and beyond mean-field approximations.
- To investigate the influence of material properties and eddy currents on magnetic avalanches.
Main Methods:
- Experimental measurement of Barkhausen noise in soft magnetic materials (polycrystals, amorphous samples).
- Analysis of temporal avalanche shapes and joint distributions of sizes and durations.
- Comparison of experimental data with theoretical predictions from avalanche theory.
Main Results:
- Excellent agreement between experiments and theory for samples without eddy currents (both long-range and short-range elasticity).
- Short-range elastic samples provide the first reliable test of avalanche theory beyond mean field.
- Thick samples (with eddy currents) show systematic deviations from scaling theory.
Conclusions:
- Avalanche theory accurately describes Barkhausen noise in soft magnetic materials under specific conditions.
- Eddy currents introduce significant deviations from theoretical predictions in thicker samples.
- The study validates and extends the applicability of avalanche theory to magnetic systems.
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