1 research outputs found
Dynamic response of exchange bias in graphene nanoribbons
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.Comment: Accepted Applied Physics Letters (In press