Ferromagnetic coupling strength through Pt is experimentally determined using ferromagnetic resonance studies of for Pt thicknesses, dPt, between 0.5 and 2.2 nm. The coupling strength decreases exponentially with the Pt thickness from 4.5 mJ/m2 for dPt = 0.5 nm and reduced to less than 0.02 mJ/m2 for dPt = 2.2 nm. The mechanism mediating exchange coupling is assumed to originate from the induced magnetization of Pt due to its proximity to ferromagnetic Py. The fitting thickness dependence of coupling with this model yields a characteristic coupling length scale of ξ = 0.31 ± 0.01 nm. Additionally, the molar susceptibility of proximity induced Pt is found to be 1.4 × 10−7 ± 0.2 × 10−7 m3/mol, an enhancement of ∼100 times as compared to bulk Pt. Ruderman-Kittel-Kasuya-Yosida type oscillations with a period of ∼0.8 nm are also observed as a small contribution of the total coupling.
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1 October 2018
Research Article|
October 01 2018
Measurements of interlayer exchange coupling of Pt in Py|Pt|Py system Available to Purchase
Pavlo Omelchenko;
Pavlo Omelchenko
a)
Department of Physics, Simon Fraser University
, 8888 University Dr, Burnaby, British Columbia V5A 1S6, Canada
a)Author to whom correspondence should be addressed: [email protected]. URL: http://surface-science.phys.sfu.ca
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Bret Heinrich;
Bret Heinrich
Department of Physics, Simon Fraser University
, 8888 University Dr, Burnaby, British Columbia V5A 1S6, Canada
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Erol Girt
Erol Girt
Department of Physics, Simon Fraser University
, 8888 University Dr, Burnaby, British Columbia V5A 1S6, Canada
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Pavlo Omelchenko
a)
Bret Heinrich
Erol Girt
Department of Physics, Simon Fraser University
, 8888 University Dr, Burnaby, British Columbia V5A 1S6, Canada
a)Author to whom correspondence should be addressed: [email protected]. URL: http://surface-science.phys.sfu.ca
Appl. Phys. Lett. 113, 142401 (2018)
Article history
Received:
August 03 2018
Accepted:
September 11 2018
Citation
Pavlo Omelchenko, Bret Heinrich, Erol Girt; Measurements of interlayer exchange coupling of Pt in Py|Pt|Py system. Appl. Phys. Lett. 1 October 2018; 113 (14): 142401. https://doi.org/10.1063/1.5050935
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