Training and recovery behaviours of exchange bias in FeNi/Cu/Co/FeMn spin valves at high field sweep rates
| Autor: | Erik Wahlström, Dezheng Yang, Magne Saxegaard, André Kapelrud |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Condensed Matter - Materials Science
Materials science Magnetoresistance Field (physics) Logarithm Spins Condensed matter physics Magnetometer Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Exchange bias law Antiferromagnetism Spin-½ |
| Popis: | Training and recovery of exchange bias in FeNi/Cu/Co/FeMn spin valves have been studied by magnetoresistance curves with field sweep rates from 1000 to 4800 Oe/s. It is found that training and recovery of exchange field are proportional to the logarithm of the training cycles and recovery time, respectively. These behaviours are explained within the model based on thermal activation. For the field sweep rates of 1000, 2000 and 4000 Oe/s, the relaxation time of antiferromagnet spins are 61.4, 27.6, and 11.5 in the unit of $ms$ respectively, much shorter than the long relaxation time (~10^2 s) in conventional magnetometry measurements. 10pages, 3 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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