Study of magnetization switching in synthetic antiferromagnets
ORAL
Abstract
Synthetic Antiferromagnet (SAF) structures are very important in designing modern spintronic devices. The theoretical studies of the toggle writing mode in MRAM$^{1}$ use the concepts of SAF critical curve, which is a generalization of the astroid from the coherent rotation model in the case of uniaxial anisotropy. Although extensively studied theoretically$^{2,3}$ there are no methods proposed to experimentally determine the critical curve of a SAF structure. We propose a way for determining the critical curve of the switching fields using reversible susceptibility experiments (RS) and we prove this to be more sensitive to the switching characteristics of SAF structures than a regular hysteresis loop. For certain coupling strengths the entire critical curve can't be determined using standard RS experiments and a strategy for revealing these hidden parts of the critical curve is proposed. 1. L. Savtchenko, B. N. Engel, N. D. Rizzo, M. F. Deherrera, and J. A. Janesky, US Patent 6,545,906 B1, (2003). 2. S. Y. Wang and H. Fujiwara, J. Magn. Magn. Mater. 286, 27-30 (2005). 3. H. Fujiwara, S. Y. Wang, and M. Sun, J. Appl. Phys. 97, 10P507-10P507-5 (2005). Work supported by DARPA grant HR0011-07-1-0031.
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Authors
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Cosmin Radu
Department of Physics \& Advanced Materials Research Institute, University of New Orleans, New Orleans, LA, USA
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Dorin Cimpoesu
Department of Physics \& Advanced Materials Research Institute, University of New Orleans, New Orleans, LA, USA, AMRI, University of New Orleans, Univ. of New Orleans Dept. of Physics \& AMRI, University of New Orleans
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Leonard Spinu
Department of Physics \& Advanced Materials Research Institute, University of New Orleans, New Orleans, LA, USA, University of New Orleans, AMRI, University of New Orleans, Univ. of New Orleans Dept. of Physics \& AMRI
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Alexandru Stancu
Faculty of Physics, University Alexadru Ioan Cuza, Iasi, Romania, Iasi University