The in-plane correlation lengths and magnetic disorder of magnetic domains in a transition metal multilayer have been studied using neutron scattering techniques. A new theoretical framework is presented connecting the observed scattering to the in-plane correlation length and the dispersion of the local magnetization vector about the mean macroscopic direction. The results unambiguously show the highly correlated nature of the antiferromagnetically coupled domain structure vertically throughout the multilayer. We are easily able to relate the neutron determined magnetic dispersion and domain correlations to magnetization and magnetotransport experiments. 75.25.+z, 75.50.Cn, 75.70.Pa The interplanar coupling and in-plane magnetic domains are essential to an understanding of the origin of the large giant magnetoresistance effect (GMR) [1] in magnetically coupled multilayers. This coupled with the advances in thin film deposition techniques [2] has led to a huge interest in magnetic multilayer systems specifically with respect to their device application possibilities. The GMR effect arises from the antiferromagnetic (AF) coupling of typically a transition metal ferromagnet (e.g. Co) across a noble metal non-magnetic spacer (e.g. Cu). This AF coupling can be realized by tuning the noble metal spacer thickness [3]. The change in resistivity results from the spin dependent scattering of the conduction electrons which depends not only on the magnetic moment alignment but also on the interfacial disorder [4] and the magnetic domain structure. Until recently the question of the relationship between magnetic domain structure and interlayer coupling has not been explored experimentally. It is clear that a vertically incoherent magnetic domain structure will have the effect of lowering the GMR by preventing perfect AF alignment in adjacent layers [5]. In studies of a weakly coupled system such as [Cu(60Å)/Co(60Å)]×20 it was shown that the reduction in the GMR from the as-prepared state to the coercive state can be understood as a loss of vertical coherence of the AF coupling [6]. The situation is different in the strongly coupled samples investigated here, the results of which clearly show magnetically correlated domains at the coercive field which extend vertically throughout the entire multilayer.The investigation of structurally rough interfaces is well established and makes use of diffuse x-ray scattering techniques. The theoretical tools for analyzing various surface morphologies are well advanced [7][8][9][10]. Recent advances in x-ray techniques have applied this structural formalism to the study of magnetically rough systems [11][12][13][14][15][16][17]. Nevertheless, the problem of quantifying magnetic roughness remains difficult primarily due to the indirect and complicated nature of the spin-photon interaction [18,19]. This problem can be resolved by neutron techniques for which the direct interaction between the neutron's dipole moment and the sample magnetization is well understood.In this letter we have p...
The effect of the ratio between the uniaxial and unidirectional anisotropy on magnetization reversal in NiFe∕MnPt bilayers has been systematically studied using vectorial vibrating magnetometer. Depending on the balance between these two anisotropies the magnetization reverses either in the opposite or the same semicircles during the ascending and descending branches of the hysteresis loop. A simple modified coherent rotation model provides a good description of the magnetization reversal in these bilayers.
Thin films of Y2O3 were grown by molecular-beam epitaxy on silicon aiming at material with adequate crystal quality for use as high-κ gate replacements in future transistors. It was found that Y2O3 grows in single-crystalline form on 4° misoriented Si(001), due to an in-plane alignment of 〈110〉Y2O2 to the silicon dimer direction. The Y2O3 layers exhibit a low degree of mosaicity, a small proportion of twinning and sharp interfaces. This represents a significant improvement compared to material grown on exact silicon surfaces.
'Experimental evidence for electron channeling in Fe/Au (100) superlattices.', Physical review letters., 86 (25).pp. 5787-5790.Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.
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