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Magnetic interactions in cuprate-manganite heterostructures and superlattices

Hanns-Ulrich Habermeier ,  Christian Bernhard ,  Jacques Chakhalian ,  Soltan Soltan ,  Gurazada Ravikumar 

Max-Planck-Institut FKF, Heisenbergstr. 1, Stuttgart D70569, Germany


Ferromagnetism and superconductivity are long range ordering principles with a mutual exclusion in homogeneous systems. However, if they are spatially separated as in thin film heterostructutres and superlattices both properties are appearing simultaneously and their interaction can be studied. Heterostructures and superlattices consisting of the half-metal ferromagnet La0.67Ca0.33MnO3 and superconducting YBa2Cu3O7 layers were fabricated by pulsed laser deposition techniques and their magnetic as well as electronic interaction were studied by a variety of techniques ranging from transport measurements to magnetic, neutron diffraction and XMCD analysis. It turns out that at the interface interaction effects are taking place at two different length scales. One is based on the self-injection of spin-polarized quasiparticles with a length scale of ~10 nm, the other is a short range exchange interaction with a length scale of ~3 nm. Furthermore, it could be shown that an so far unknown coupling of adjacent magnetic layers occurs when the superlattices are cooled through the superconducting transition temperature.


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Presentation: Invited oral at E-MRS Fall Meeting 2006, Symposium K, by Hanns-Ulrich Habermeier
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-06-13 18:35
Revised:   2009-06-07 00:44