Magnetic anisotropy of multilayer periodical structures from magnetic nanoislands.

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Magnetic anisotropy of multilayer periodical
structures from magnetic nanoislands.

• Boltaev A.P., Pudonin F.A., Sherstnev I.A.
• P.N.Lebedev Physical Institute of the Russian
  Academy of Science, 119991, Moscow, Russia

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Contents

• Introduction
• Some properties of multilayer island structures
• One-directional anisotropy in island structures
• Rotation in of samples in magnetic field
• Vortex in magnetic nanostructures
• Conclusion

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Spin-tunneling structure
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Multilayer periodical island system

• RF-sputtering systems
• (FeNi - CoNi)10
• (FeNi - C) 10
• (FeNiCo - Co)10

• Layer thickness 0,4-0,8 nm
• Island size 6-30 nm
• Distance between
• islands 1 6 nm
• Number of layers 1-20

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AFM and MFM images of the (FeNi-CoNi)N structure
surface

• Surface topography

Magnetic topograpgy of the surface
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Magnetoresistance of (FeNi-CoNi)10
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Kerr effect for system (FeNi-CoNi)20 at different
orientation of magnetic field
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Polar diagrams of sample magnetization
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Exchange anisotropy
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Experimental hysteresis loops
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The dependence of magnetization on rotation
direction of sample in magnetic field.
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Vortexes in ferromagnetic nanoparticles

• Vortex in ferromagnetic disk

• Possible magnetization in nanoislands system

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Results of modeling
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Vortex magnetic field in samples
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Results of vortex magnetic field action
Action
Action
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Result of vortex magnetic field action

• Before action

• After action

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Conclusion

• Thanks you!

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Possible situation