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Delta doping of ferromagnetism in antiferromagnetic manganite superlattices
Journal article   Open access   Peer reviewed

Delta doping of ferromagnetism in antiferromagnetic manganite superlattices

T S Santos, B J Kirby, S Kumar, S J May, J A Borchers, B B Maranville, J Zarestky, S G E te Velthuis, J van den Brink and A Bhattacharya
Physical review letters, v 107(16), 167202
14 Oct 2011
DOI: https://doi.org/10.1103/PhysRevLett.107.167202
PMID: 22107423
url
https://doi.org/10.1103/PhysRevLett.107.167202View
Published, Version of Record (VoR)Maybe Open Access (Publisher Bronze),  Open

Abstract

We demonstrate that delta doping can be used to create a dimensionally confined region of metallic ferromagnetism in an antiferromagnetic (AFM) manganite host, without introducing any explicit disorder due to dopants or frustration of spins. Theoretical consideration of these additional carriers shows that they cause a local enhancement of ferromagnetic double exchange with respect to AFM superexchange, resulting in local canting of the AFM spins. This leads to a highly modulated magnetization, as measured by polarized neutron reflectometry. The spatial modulation of the canting is related to the spreading of charge from the doped layer and establishes a fundamental length scale for charge transfer, transformation of orbital occupancy, and magnetic order in these manganites. Furthermore, we confirm the existence of the canted, AFM state as was predicted by de Gennes [Phys. Rev. 118, 141 (1960)] but had remained elusive.

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Physics, Multidisciplinary
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