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Emergent Phenomena at Oxide Interfaces Studied with Ultrafast Lasers

Emergent Phenomena at Oxide Interfaces Studied with Ultrafast Lasers

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When Oct 16, 2013
from 02:00 pm to 03:30 pm
Speaker Gunter Lüpke
Speaker Information Department of Applied Science, College of William & Mary
Where 1311HN
Contact Name Yuhang Ren
Contact Email
Contact Phone 212-772-5258
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Abstract

Complex oxides are fascinating systems which host a vast array of unique phenomena, such as high temperature (and unconventional) superconductivity, ‘colossal’ magnetoresistance, all forms of magnetism and ferroelectricity, as well as (quantum) phase transitions and couplings between these states. In recent years, there has been a mini-revolution in the ability to grow thin film heterostructures of these materials with atomic precision. With this level of control, the electrostatic boundary conditions at oxide surfaces and interfaces can be used to form new electronic phases. Between two insulators, for example, metallic, superconducting, and magnetic states can be induced. After a general overview, I will focus on heterostructures incorporating perovskite manganites, materials which show a canonically strong coupling between charge, spin, and lattice degrees of freedom. First, the interfacial spin state of the multiferroic heterostructure PbZr0.52Ti0.48O3 / La0.67Sr0.33MnO3 and its dependence on ferroelectric switching is investigated with magnetic second-harmonic generation. The cross-coupling between ferroelectric and ferromagnetic behavior at the interface layer is purely electronic, due to charge injection. Second, I will report on a study of the uniform spin precession dynamics in (LMO)2n/(SMO)n superlattices by the time-resolved magneto-optical Kerr effect. The one-spin model typically invoked does not adequately explain the observed frequency-field behavior for the case where n³2. We propose a model that ascribes the emergence of exchange torque in the manganite superlattice to the coupling between two spin populations – viscous and fast spins. The present results provide new insight into the interface spin system of complex oxide heterostructures, and have implications for the development of new interface-based functionalities and device concepts.

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