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Changes of Structure and Magnetic Properties of (Ni_{80}Fe_{20}/Au/Co/Au)_N Multilayers as a Function of Repetition Number N

100%

Szymański B., Stobiecki F., Urbaniak M., Siffalovic P., Majkova E.

Acta Physica Polonica A

2008

vol. 113

issue 1

205-208

The influence of repetition number N on magnetoresistance, magnetic reversal and structure of sputtered (Ni_{80}Fe_{20}/Au/Co/Au)_N multilayers was investigated. The multilayers are characterized by in-plane (Ni_{80}Fe_{20}) and out-of-plane (Co) magnetic anisotropy of ferromagnetic layers and show considerable magnetoresistance effect (ΔR/R) of the giant magnetoresistance type. Increased N results in an enhancement of ΔR/R from about 0.5% for N=1 up to above 5% for N=15. This enhancement is caused by: diminishing the role of electron scattering at the surfaces, decreasing the effect of structural imperfection and the lack of the perpendicular anisotropy of Co layer in the first period. The interpretation is corroborated by low ΔR/R value observed for N=1 and an evolution of the ΔR(H)/R dependence with increasing N. The anisotropy field of Co layers also increases with N.

Fabrication and Characterization of Hybrid Tunnel Magnetoresistance Structures with Embedded Self-Assembled Nanoparticle Templates

59%

Siffalovic P., Majkova E., Chitu L., Halahovets Y., Jergel M., Senderak R., Luby S., Weis M., Satka A., Szymański B., Stobiecki F., Timmann A., Roth S.

Acta Physica Polonica A

2009

vol. 115

issue 1

332-335

We report on an incorporation of self-assembled templates of superparamagnetic Fe-O nanoparticles into tunnel magnetoresistance devices. We fabricated a multilayer stack composed of the following layer sequence: Cr/Au/Co/NP/Co/Cu on Si(100) substrate where NP stands for a self-assembled layer of nanoparticles deposited by the Langmuir-Blodgett technique. The X-ray reflectivity and grazing-incidence small angle X-ray scattering were employed to study the layers thicknesses and interface morphology in each preparation step. In particular, the grazing-incidence small angle X-ray scattering was measured before and after the nanoparticle incorporation as well as on the complete tunnel magnetoresistance stack. In this way, in-depth morphology profile during subsequent preparation steps was obtained. We demonstrate that X-ray analysis of the deposited tunnel magnetoresistance stack is essential for successful fabrication of novel hybrid devices consisting of self-assembled nanoparticles.

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2 Acta Physica Polonica A

1 2009

1 2008

2 Majkova E.

2 Siffalovic P.

2 Stobiecki F.

2 Szymański B.

1 Chitu L.

1 Halahovets Y.

1 Jergel M.

1 Luby S.

1 Roth S.

1 Satka A.

1 Senderak R.

1 Timmann A.

1 Urbaniak M.

1 Weis M.

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Changes of Structure and Magnetic Properties of (Ni_{80}Fe_{20}/Au/Co/Au)_N Multilayers as a Function of Repetition Number N

Fabrication and Characterization of Hybrid Tunnel Magnetoresistance Structures with Embedded Self-Assembled Nanoparticle Templates