Fe/V superlattices

Fig. 7.4. H only enters the paramagnetic V spacer layers in a Fe/V superlattice, modifying the interlayer exchange coupling/.

Fig. 7.5 Cross-section TEM of a Fe/V superlattice, showing well defined, smooth layers. Image taken from A. Broddefalk et al., Phys. Reu. B, 65 214430 (2002).

Fig. 7.6 XMCD measurements of different smooth Fe/V superlattices grown at 300 K compared with a homogeneous Fe/V alloy (A). The induced V moment obviously increases with the number of neigh-...

The modified electronic structure of the H-loaded V as compared to the pure metal is not only responsible for the change in the I EC in Fe/V superlattices, it also influences the magnetic moments. SQUID magnetization measurements of hydrogen-loaded Fe/V superlattices show a proportional increase in the saturation moments with the hydrogen concentration after hydrogen loading for all samples. 

Hag] Hagiwara, M., Seki. J.-L, Suzuki, T., CsCl Type Superlattice Formation in V-Mn-Fe, Fe-V-Cr, and V -Mn-Cr Ternary Alloys (in Japanese), J. Jpn. Inst. Met, 39, 402-408 (1975) (Phase Diagram, Phase Relations, Thermodyn., Calculations, Experimental, 27)... 

V.V. Moshchalkov, Y. Bruynseraede Giant magnetoresistance in Fe/Cr superlattices with very thin Fe layers, Appl. Phys. Lett. 6A, 3500 (199A)... 

Due to their favorable properties, which will be discussed in the following, superlattices consisting of Fe and V became the model system to study the influence of H on exchange coupled superlattices and a variety of different phenomena have been discovered. In the following we will discuss this system in more detail (Fig. 7.4). 

Fig. 7.7 Saturation field as a function of the V layer thickness for AF coupled Fe(3)/V(x) superlattices, obtained by magneto-optic Kerr effect and SQUID measurements. The thicknesses which are accessible by loading the samples with hydrogen are marked by arrows in the figure. Taken from Hjorvarsson et al. (1997), ref [38].

Fig. 7.8 (A) Magnetization oftheAF coupled Fe(2)/VHx(13) superlattice as a function of temperature for the H free state and forx = 0.017 H/V and 0.021 H/V, respectively. (B) Magnetic phase diagram for the superlattice determined by neutron reflec-...

Fig. 7.10 Magnetic asymmetry ratios measured on a [Fe(2)/V(15)]3o sample in the vicinity of the Fe L-edges in reflection at the second superlattice peak prior (bold line) and after (light line) hydrogen exposure.

Fig. 7.n Evolution of Fe magnetic moments with increasing hydrogen concentration ch for a Fe[(2ML)/V(15ML)] superlattice with ideal interfaces. Image taken from Remhofet al., ref [50]. 

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