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Results obtained on

Results obtained on. Sample GX 98 1. Ta(50Å)/Cu(350Å)/ Pt(30Å)/ [Co(2.5Å)/Pt(5.2Å)]x5/Co(2Å)/ [Ni(6Å)/Co(1Å)]x2/ Co(1Å)/ Cu(40Å) / Co(1Å)/ [Co(1Å)/Ni(6Å)]x4/ Co(2Å) Cu(40Å)/ Co40Fe60(40 Å)/ Cu(150Å)/ Ta(50Å). No DC current applied. Circle 50nm.

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Results obtained on

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  1. Results obtained on Sample GX 98 1 Ta(50Å)/Cu(350Å)/ Pt(30Å)/ [Co(2.5Å)/Pt(5.2Å)]x5/Co(2Å)/ [Ni(6Å)/Co(1Å)]x2/ Co(1Å)/ Cu(40Å) / Co(1Å)/ [Co(1Å)/Ni(6Å)]x4/ Co(2Å) Cu(40Å)/ Co40Fe60(40 Å)/ Cu(150Å)/ Ta(50Å) No DC current applied

  2. Circle 50nm

  3. At 4 degres of the axe that was suppose to be the direction perpendicular to the film plane

  4. 5 degres 6 degres

  5. R versus t measurement

  6. From the following model it looks that we are observing transition between the two following states

  7. Simple three-dipole model Three magnetic dipoles µi (i = 1,2,3) located on the vertical axis z, with first order uniaxial anisotropies of magnitudes ki and axis z. Distances between dipoles are dij (i j) For each dipole, the energy writes: Total Energy: Dipole 1 : k1 = 6×106 erg/cm2 (=K×t), µ1 = 1800 emu/cm2 (=MS×t, with t in nm) Dipole 2 : k2 = 3×105 erg/cm2 (=K×t), µ2 = 900 emu/cm2 (=MS×t, with t in nm) Dipole 3 : k3 = -3×106 erg/cm2 (=K×t), µ3 = 1800 emu/cm2 (=MS×t, with t in nm) Distances: d12 = 3 nm, d22 = 3 nm, d13 = d12 + d23 = 6 nm

  8. qH = 0° H -5000 Oe -2500 Oe -2600 Oe -100 Oe +100 Oe +2500 Oe +7700 Oe +7800 Oe Increasing field branch

  9. qH = +1° H -5000 Oe -2500 Oe -100 Oe +100 Oe +3000 Oe +3100 Oe +6000 Oe +6100 Oe Increasing field branch

  10. qH = +6° H Field ranges exist where two magnetic states are stable. They essentially differ in the orientation of the magnetization of the layer with in-plane anisotropy -1400 Oe H  H  +1200 Oe H  H 

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