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

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

Spin-tunneling structure

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

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

Surface topographyMagnetic topograpgy of the surface

Magnetoresistance of (FeNi-CoNi)10

Kerr effect for system (FeNi-CoNi)20 at different orientation of magnetic field

Polar diagrams of sample magnetization

Exchange anisotropy

Experimental hysteresis loops

The dependence of magnetization on rotation direction of sample in magnetic field.

Vortexes in ferromagnetic nanoparticles

Vortex in ferromagnetic disk Possible magnetization in nanoislands system

Results of modeling

Vortex magnetic field in samples

Action

Action

Results of vortex magnetic field action

Result of vortex magnetic field action

Before action After action

Conclusion

Thanks you!

Possible situation