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| Size and Aspect Ratio Effects on the Magnetic Properties of a Spin-Valve Multilayer by Computer Simulation |
| Journal of Magnetics, Volume 5, Number 3, 30 Sep 2000, Pages 90-98 |
S. H. Lim*  (Thin Film Technology Research Center Korea Institute of Science and Technology), S. H. Han(Thin Film Technology Research Center Korea Institute of Science and Technology), K. H. Shin(Thin Film Technology Research Center Korea Institute of Science and Technology), H. J. Kim(Thin Film Technology Research Center Korea Institute of Science and Technology) |
| Abstract |
| The change in the magnetic properties of a spin-valve multilayer with the structure IrMn (9 nm)/CoFe (4 nm)/Cu (2.6 nm)/CoFe (2 nm)/NiEe (6 nm) is investigated as a function of the size and the aspect ratio. At a fixed aspect ratio (the length/width ratio) of 2, the magnetostatic interactions begin to affect the magnetic properties substantially at a spin-valve length of 5 µm, and, at a length of 1 µm, they become even more dominant. In the case of a fixed multilayer size (2.4 µm) which is indicated by the sum of the length and the width, magnetization change occurs by continuous spin-reversal and M-H loops are characterized by no or very small hysteresis at aspect ratios smaller than unity, At aspect ratios greater than unity, magnetization change occurs by spin-flip resulting in squared hysteresis loops. A very large changes in the coercivity and the bias field is observed, and these results are explained by two separate contributions to the total magnetostatic interactions: the coercivity by the self-demagnetizing field and the bias field by the interlayer magnetostatic interaction field. |
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