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Temperature Dependence of Exchange Coupling on Magnetic funnel Junctions
Journal of Magnetics, Volume 8, Number 1, 31 Mar 2003, Pages 32-35
Abstract
Magnetic funnel Junctions (MTJs) were fabricated on thermally oxidized Si (100) wafers using DC magnetron sputtering. The film Structures were Ta(50Å)/CU(100Å)Ni80/Fe20/(20Å)/Cu(50Å)/Mn75Ir25(100Å)/Co70Fe30/(25Å)/Al-O(15Å)/Co70Fe30(25Å)/Ni80Fe20(t)/Ta(50Å), with t= 0Å , 100 and 1000Å, respectively. X-ray diffraction has shown improvement of (111) texture of IrMn3 and Cu by annealing. The exchange-biased energy is almost inversely proportional to temperature. The difference between the coercivity Hc and the exchange biased field HE for t = 0 sample is smaller than that for t = 1000Å. For the pinned layer, the decreasing rate of the coercivity with the temperature is higher compared to that of the exchange field, but variation of Hc is similar to that of the exchange field for free layer.
Keywords: TMR; XRD; exchange coupling
DOI:
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