Temperature dependence of exchange coupling in Mn75Ir 25/Co70Fe30/AlOx/Co 70Fe30/Ni80Fe20 MTJs

Y. K. Hu, S. M. Yoon, J. J. Lim, V. K. Sankaranarayanan, C. G. Kim, C. O. Kim, M. Tsunoda, M. Takahashi

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1 Citation (Scopus)


Magnetic Tunnel Junctions (MTJs) were fabricated on thermally oxidized Si(100) wafers by utilizing DC magnetron sputtering. Magnetic properties of MTJs with structure of Ta(50)/Cu(100)/Ta(50)/Ni80Fe20(20)/ Cu(50)/Mn75Ir25(100)/Co70Fe30(25)/ AlOx(15)/Co70Fe30(25)/Ni80Fe 20(t)/Ta(50), where t = 0, 100 and 100 Å, were investigated by using SQUID, XRD and MR analyzer. Exchange bias field is inversely proportional to temperature for t = 0 Å sample. XRD shows the improvement of (111) texture of IrMn3 and Cu after annealing. The exchange bias field decreases with increasing temperature due to thermal effect. And it is the highest for t = 100 Å due to increased crystallites size of IrMn 3. For the free layer, the temperature dependence of interlayer exchange coupling involves the same mechanism as that of exchange bias.

Original languageEnglish
Pages (from-to)1700-1703
Number of pages4
JournalPhysica Status Solidi (A) Applied Research
Issue number8
Publication statusPublished - 2004 Jun


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