Accession Number ADA570892
Title Dynamic Response of Exchange Bias in Graphene Nanoribbons.
Publication Date 2012
Media Count 18p
Personal Author J. Vanacken S. N. Jammalamadaka S. S. Rao V. V. Moshchalkov W. Lu
Abstract The dynamics of magnetic hysteresis, including the training effect and the field sweep rate dependence of the exchange bias, is experimentally investigated in exchange-coupled potassium split graphene nanoribbons (GNRs). We find that, at low field sweep rate, the pronounced absolute training effect is present over a large number of cycles. This is reflected in a gradual decrease of the exchange bias with the sequential field cycling. However, at high field sweep rate above 0.5 T/min, the training effect is not prominent. With the increase in field sweep rate, the average value of exchange bias field grows and is found to follow power-law behavior. The response of the exchange bias field to the field sweep rate variation is linked to the difference in the time it takes to perform a hysteresis loop measurement compared with the relaxation time of the anti-ferromagnetically aligned spins. The present results may broaden our current understanding of magnetism of GNRs and would be helpful in establishing the GNRs-based spintronic devices.
Keywords Bias
Dynamic magnetic properties
Dynamic response
Exchange bias
Field sweep rate and graphene nanoribbons
Graphene
Hysteresis
Magnetic properties
Training effect


 
Source Agency Non Paid ADAS
NTIS Subject Category 46 - Physics
Corporate Author Army Research Office, Research Triangle Park, NC.
Document Type Journal article
Title Note Journal article.
NTIS Issue Number 1315
Contract Number FA9550-09-1-0581 00006766

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