Transverse thermoelectric effect in La0.67Sr0.33MnO3|SrRuO3 superlattices

Transverse thermoelectric effects in response to an out-of-plane heat current have been studied in an external magnetic field for ferromagnetic superlattices consisting of La0.67Sr0.33MnO3 and SrRuO3 layers. The superlattices were fabricated on SrTiO3 substrates by pulsed laser deposition. We found that the sign of the transverse thermoelectric voltage for the superlattices is opposite to that for La0.67Sr0.33MnO3 and SrRuO3 single layers at 200 K, implying an important role of spin Seebeck effects inside the superlattices. At 10 K, the magnetothermoelectric curves shift from the zero field due to an antiferromagnetic coupling between layers in the superlattices.

[1]  S. Maekawa,et al.  Observation of the spin Seebeck effect , 2008, Nature.

[2]  Sung-chul Shin,et al.  Thermoelectric Signal Enhancement by Reconciling the Spin Seebeck and Anomalous Nernst Effects in Ferromagnet/Non-magnet Multilayers , 2015, Scientific Reports.

[3]  Masatoshi Imada,et al.  Metal-insulator transitions , 1998 .

[4]  Y. Tokura,et al.  Topological Nernst effect in a three-dimensional skyrmion-lattice phase , 2013 .

[5]  Andrew G. Glen,et al.  APPL , 2001 .

[6]  Y. Shiomi,et al.  Paramagnetic spin pumping. , 2014, Physical review letters.

[7]  Y. Lee,et al.  Role of Oxygen 2p states for anti-ferromagnetic interfacial coupling and positive exchange bias of ferromagnetic LSMO/SRO bilayers , 2008 .

[8]  D. Hesse,et al.  Existence of a magnetically ordered hole gas at the La0.7Sr0.3MnO3/SrRuO3 interface , 2013 .

[9]  G. J. Snyder,et al.  Enhancement of Thermoelectric Efficiency in PbTe by Distortion of the Electronic Density of States , 2008, Science.

[10]  Hideo Ohno,et al.  Mott relation for anomalous Hall and Nernst effects in Ga1-xMnxAs ferromagnetic semiconductors. , 2008, Physical review letters.

[11]  S. Maekawa,et al.  Observation of longitudinal spin-Seebeck effect in magnetic insulators , 2010 .

[12]  Berry-phase effect in anomalous thermoelectric transport. , 2006, Physical review letters.

[13]  H. Hwang,et al.  BASIC NOTIONS , 2022 .

[14]  Y. Tokura,et al.  Anomalous nernst effects in pyrochlore molybdates with spin chirality. , 2008, Physical review letters.

[15]  P. Padhan,et al.  Magnetocaloric effect and improved relative cooling power in (La0.7Sr0.3MnO3/SrRuO3) superlattices , 2010, Journal of physics. Condensed matter : an Institute of Physics journal.

[16]  D. Hesse,et al.  Tailoring magnetic interlayer coupling in La0.7Sr0.3MnO3/SrRuO3 superlattices. , 2010, Physical review letters.

[17]  S. Heinze,et al.  Thermoelectric Properties of YBa2Cu3O7-(La,Ca)MnO3 Superlattices , 2012, 1209.3561.

[18]  P. Padhan,et al.  Size effect on magnetic coupling in all-ferromagnetic superlattices , 2011 .

[19]  R J Cava,et al.  Anomalous hall heat current and nernst effect in the CuCr2Se4-xBrx ferromagnet. , 2004, Physical review letters.

[20]  Yasunobu Nakamura,et al.  Spin-current-driven thermoelectric coating. , 2012, Nature materials.

[21]  M. Ziese,et al.  Properties of manganite/ruthenate superlattices with ultrathin layers , 2013 .

[22]  B. V. van Wees,et al.  Spin caloritronics. , 2011, Nature materials.

[23]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[24]  E. Pippel,et al.  Strain dependence of antiferromagnetic interface coupling inLa0.7Sr0.3MnO3/SrRuO3superlattices , 2014, 1411.0411.

[25]  C. Bark,et al.  Spin structure in an interfacially coupled epitaxial ferromagnetic oxide heterostructure. , 2013, Physical review letters.

[26]  D. Satapathy,et al.  Competing interactions at the interface between ferromagnetic oxides revealed by spin-polarized neutron reflectometry , 2012 .

[27]  N. Nagaosa,et al.  Quantum transport theory of anomalous electric, thermoelectric, and thermal Hall effects in ferromagnets , 2007, 0712.0210.

[28]  D. Hesse,et al.  Inverted hysteresis and giant exchange bias in La0.7Sr0.3MnO3/SrRuO3 superlattices , 2010 .