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(Microsoft PowerPoint - Acad\351mie_08.ppt [Lecture seule])

(Microsoft PowerPoint - Acad\351mie_08.ppt [Lecture seule])

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Co/Cu/Py (« wavy » angular variationcalculated by Barnas, AF et al, PR B 2005)100x170nm²Aufree Py:fast spinrelaxationfixed Co: slower spinrelaxationPower (pW/GHz)3020100H = 2 Oe H ≈ 0 (2 Oe)Py (8nm, free)Cu ( 8nm)Co (8nm, fixed)IrMn (15nm)or CoO or Cu9,5 mA9 mA8,5 mA8 mA7,5mA7 mA6,5 mA6 mAdV/dI (Ω)15,615,014,41.5 2.0 2.5 3.0 3.5Boulle, AF et al,Frequency (GHz) Nature Phys. 2007oscillations at H=0Py/Cu/Py (standard)5600G9G-4 0I (mA)Negative I (mA)H ≈ 0Positive I

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