Münster 1999 – wissenschaftliches Programm

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AM: Magnetismus

AM 1: Dünne magnetische Schichten und Vielfachschichten, magnetooptische Schichten I

AM 1.7: Vortrag

Montag, 22. März 1999, 11:15–11:30, F5

Influence of hydrogen on the interlayer exchange coupling in Fe/V superlattices — •D. Labergerie¹, C. Sutter¹, H. Zabel¹, and B. Hjörvarsson² — ¹Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum — ²Royal Institute of Technology, Materialphysics,S-100 44 Stockholm, Sweden.

We have studied the influence of hydrogen on the magnetic exchange coupling between iron layers through vanadium spacer layers in (Fe₃/V_x)₃₀ (x=11 to 16 Ml) superlattices with MOKE measurements.Without hydrogen (Fe₃/V_x) show antiferromagnetic (AFM) coupling for x=12 to 14 and ferromagnetic (FM) coupling in all others cases. With hydrogen loading the coupling can be reversibly switched from AFM to FM and vice versa as has been previously found with polarized neutron reflectivity measurements^a. We have extended these measurements and have taken full hysteresis curves with fields up to 2000 Oe. Bilinear and biquadratic exchange coupling can be recognized by the magnetic hysteresis loops and their magnetic coupling constants J₁ and J₂ can be extracted^b.
^a B. Hjörvarsson et al., Phys. Rev. Lett. 79, 901 (1997).
^b D. Labergerie et al., JMMM (accepted for publication).