By a News Reporter-Staff News Editor at Journal of Technology -- Researchers detail new data in Magnetics. According to news reporting out of Burnaby, Canada, by VerticalNews editors, research stated, "We investigate the effect of crystal symmetry driven tensor form of micromagnetic exchange stiffness A on switching properties of L1(0) FePt composite nano-structures. The exchange interaction term in micromagnetic energy functional have been constructed to capture the results of the first principle calculations for magnetic excitations in  and  directions."
Our news journalists obtained a quote from the research from Simon Fraser University, "We find that out-of-plane (OP) exchange component (A(perpendicular to)) is about two times weaker as compared to the in-plane (IP) component (A(parallel to)). We study the effect of this difference between principal axis elements of A tensor on the M-H loops using micromagnetic simulations. We compare two cases for IP and OP exchange constants: (a) A(perpendicular to) = A(parallel to) (limited case) and (b) A(perpendicular to) = 0.5 A(parallel to) (based on ab-initio calculations), and find that the athermal coercive force for 30 x 30 nm bi-layer rectangular dots differs for these two cases."
According to the news editors, the research concluded: "Further, we find that the coercive force difference between two cases decreases as the external field goes from OP to IP."
For more information on this research see: Micro Magnetic Exchange Interaction Tensor and Magnetization Reversal of L1(0) FePt Based Alloy Thin Film Nano-Structures. IEEE Transactions on Magnetics, 2013;49(7):3799-3801. IEEE Transactions on Magnetics can be contacted at: Ieee-Inst Electrical Electronics Engineers Inc, 445 Hoes Lane, Piscataway, NJ 08855-4141, USA. (Institute of Electrical and Electronics Engineers - www.ieee.org/; IEEE Transactions on Magnetics - ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=20)
Our news journalists report that additional information may be obtained by contacting A. Singh, Simon Fraser University, Dept. of Phys, Burnaby, BC V5A 1S6, Canada. Additional authors for this research include O. Mryasov, S. Gupta, S. Okatov, K.Z. Gao and E. Girt.
Keywords for this news article include: Canada, Burnaby, Magnetics, British Columbia, North and Central America
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