Leufke, Philipp ; Kruk, Robert ; Brand, Richard ; Hahn, Horst (2013)
In situ magnetometry studies of magnetoelectric LSMO/PZT heterostructures.
In: Physical Review B, 87 (9)
doi: 10.1103/PhysRevB.87.094416
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
In order to identify and quantify characteristics of the magnetoelectric coupling at ferromagnetic/ferroelectric interfaces, epitaxial La1−xSrxMnO3/Pb(Zr,Ti)O3 (LSMO/PZT) heterostructures were deposited by large-distance magnetron sputtering. The remarkably high lateral uniformity achieved in such films allowed for a ferroelectric device area of more than 6 mm2. This has enabled for superconductive quantum interference device (SQUID) measurements of the magnetic response to the systematically, completely in situ, varied remanent ferroelectric polarization. Temperature dependence of the magnetic modulation upon charging and the magnetic response to the ferroelectric stimulation indicate a field-effect dominated coupling mechanism and generally confirm the concept of electrostatic hole (h+) doping of LSMO. The modulation of magnetization was comprehensively analyzed for a broad range of electrostatically induced surface charge concentrations. For small charge modulations at low temperature a linear tuning coefficient of ≈−3.6μB/h+ has been determined. This suggests the activation of an antiferromagnetic coupling, even for very small surface charge densities. Simultaneously, a shift in the magnetic transition temperature at higher surface charge concentration indicates the presence of a ferromagnetic phase at the LSMO/PZT interface. Eventually, a physical picture of magnetoelectric coupling is proposed in which these quantitative results are consistently interpreted, in terms of a surface-charge dependent electronic phase separation with the coexistence of antiferromagnetic and ferromagnetic regions at the ferromagnetic/ferroelectric interface.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2013 |
| Autor(en): | Leufke, Philipp ; Kruk, Robert ; Brand, Richard ; Hahn, Horst |
| Art des Eintrags: | Bibliographie |
| Titel: | In situ magnetometry studies of magnetoelectric LSMO/PZT heterostructures |
| Sprache: | Englisch |
| Publikationsjahr: | 14 März 2013 |
| Verlag: | American Physical Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review B |
| Jahrgang/Volume einer Zeitschrift: | 87 |
| (Heft-)Nummer: | 9 |
| DOI: | 10.1103/PhysRevB.87.094416 |
| Kurzbeschreibung (Abstract): | In order to identify and quantify characteristics of the magnetoelectric coupling at ferromagnetic/ferroelectric interfaces, epitaxial La1−xSrxMnO3/Pb(Zr,Ti)O3 (LSMO/PZT) heterostructures were deposited by large-distance magnetron sputtering. The remarkably high lateral uniformity achieved in such films allowed for a ferroelectric device area of more than 6 mm2. This has enabled for superconductive quantum interference device (SQUID) measurements of the magnetic response to the systematically, completely in situ, varied remanent ferroelectric polarization. Temperature dependence of the magnetic modulation upon charging and the magnetic response to the ferroelectric stimulation indicate a field-effect dominated coupling mechanism and generally confirm the concept of electrostatic hole (h+) doping of LSMO. The modulation of magnetization was comprehensively analyzed for a broad range of electrostatically induced surface charge concentrations. For small charge modulations at low temperature a linear tuning coefficient of ≈−3.6μB/h+ has been determined. This suggests the activation of an antiferromagnetic coupling, even for very small surface charge densities. Simultaneously, a shift in the magnetic transition temperature at higher surface charge concentration indicates the presence of a ferromagnetic phase at the LSMO/PZT interface. Eventually, a physical picture of magnetoelectric coupling is proposed in which these quantitative results are consistently interpreted, in terms of a surface-charge dependent electronic phase separation with the coexistence of antiferromagnetic and ferromagnetic regions at the ferromagnetic/ferroelectric interface. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Gemeinschaftslabor Nanomaterialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 06 Feb 2014 08:22 |
| Letzte Änderung: | 06 Feb 2014 08:22 |
| PPN: | |
| Sponsoren: | This work was partially supported by the Deutsche Forschungsgemeinschaft (DFG) under Contract No. HA1344/28-1. , The authors acknowledge support from the KNMF Laboratory for Spectroscopy and Microscopy and the State of Hessen for an equipment grant. |
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