Dynamic response of exchange bias in graphene nanoribbons

J, Suryanarayana and Rao, S S and Vanacken, J and Moshchalkov, V V and Lu, W and Tour, J M (2012) Dynamic response of exchange bias in graphene nanoribbons. Applied Physics Letters, 101 (14). pp. 1-6. ISSN 0003-6951

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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

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IITH Creators:

IITH Creators	ORCiD
J, Suryanarayana	UNSPECIFIED

Item Type:

Article

Additional Information:

J.M.T. thanks Mitsui & Co., Ltd., M. Endo and A. Tanioka for generously donating the starting MWCNTs, the AFOSR (FA9550-09-1- 0581) and the Office of Naval Research Graphene MURI Pro- gram (00006766, N00014-09-1-1066) for support.

Uncontrolled Keywords:

Average values; Exchange bias; Exchange-bias fields; Field-cycling; Graphene nanoribbons; High field; Hysteresis loop measurements; In-field; Low field; Number of cycles; Power-law behavior; Spintronic device; Sweep rates; Training effects

Subjects:

Physics

Divisions:

Department of Physics

Depositing User:

Team Library

Date Deposited:

11 Nov 2014 04:04

Last Modified:

12 Sep 2017 06:51

URI:

http://raiithold.iith.ac.in/id/eprint/672