Kaur, M. and Raju, M. and Varandani, D. and Gupta, Anurag and Senguttuvan, T. D. and Mehta, B. R. and Budhani, R. C. (2015) Reversal and thermal stability of ordered moments in nano-rings of perpendicular anisotropy Co/Pd multilayers. Journal of Physics D: Applied Physics, 48 (29). ISSN 0022-3727

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Magnetic properties of the ring array made with ultrathin (Pd-/Co-layer thickness similar to 0.5/0.25 nm) Co/Pd multilayers are reported. Systematic investigation of magnetization loops M(H) at varying temperatures (T = 3-300K) and magnetic relaxations (at T = 300 K) were carried out in a plain film and ring arrays with different ring widths of 660, 500 and 340 nm. The M(H) loops of all the samples show anisotropy distribution, a reversal mechanism facilitated by nucleation of the reverse domain followed by pinning dependent domain wall motion, and a thermally stable remanant state with U-b/kT > 250 (at T = 300 K, where U-b is the activation barrier). Both anisotropy distribution and pinning are found to increase in the nanostructures along with a precipitous rise of the reversal field below approximate to 100 K. These results are discussed in terms of the presence of chemically sharp/disordered interface regions and inter-layer interactions in the Co/Pd multilayers.

Item Type: Article
Uncontrolled Keywords: magnetization of PMA nanorings, reverse domains, magnetic reversal, MFM
Subjects: Applied Physics/Condensed Matter
Depositing User: Dr. Rajpal Walke
Date Deposited: 06 Oct 2016 07:09
Last Modified: 06 Oct 2016 07:09
URI: http://npl.csircentral.net/id/eprint/1973

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