Temperature effect on exchange coupling and magnetization reversal in antiferromagnetically coupled (Co/Pd) multilayers

QC 20150911
Magnetization reversal of antiferromagnetically coupled (AFC) soft and hard (Co/Pd) multilayers was studied as a function of temperature. While the hard [Co(0.3 nm)/Pd(0.8 nm)](x10) was kept unchanged, the softness of the [Co(t)/Pd(0.8 nm)](x3) was controlled by varying the thickness t of the Co sublayer. Clear two-step hysteresis loops were observed for all the investigated multilayers with t ranging between 0.4 and 1 nm. The spin reorientation of the soft layer magnetization from in-plane direction to out-of-plane direction was investigated from 50 to 300 K. The antiferromagnetic field H-AFC measured from the shift of the minor hysteresis loop reveals a good agreement to the quantum-well model. From the out-of-plane hysteresis loop of the uncoupled soft layer, its magnetization shows an in-plane orientation for t >= 0.6 nm. The strong H-AFC helps to induce an out-of plane orientation of the soft layer with a linear decrease of its coercivity with temperature. These investigated structures show the possibility to reduce the unwanted stray field and improving the out-of-plane anisotropy even for relatively thicker soft layer. (c) 2015 AIP Publishing LLC.

Al-Omari, I. A. (author)
Kharel, P. R. (author)
Ranjbar, MojtabaGothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU) (author)
Sellmyer, D. J. (author)
Åkerman, Johan,1970KTH,Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),Materialfysik, MF,University of Gothenburg, Sweden(Swepub:kth)u13m1xx2 (author)
Piramanayagam, S. N. (author)
Göteborgs universitetInstitutionen för fysik (GU) (creator_code:org_t)

By the author/editor: Sbiaa, R.; Al-Omari, I. A.; Kharel, P. R.; Ranjbar, Mojtaba; Sellmyer, D. J.; Åkerman, Johan, ...; show more...; Piramanayagam, S ...; show less...

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