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Deep probing of the photospheric sunspot penumbra: no evidence of field-free gaps
Borrero, J. M.,Asensio Ramos, A.,Collados, M.,Schlichenmaier, R.,Balthasar, H.,Franz, M.,Rezaei, R.,Kiess, C.,Orozco Suá,rez, D.,Pastor, A.,Berkefeld, T.,von der Lü,he, O.,Schmidt, D.,Schmid Springer-Verlag 2016 Astronomy and astrophysics Vol.596 No.-
SUPERSONIC MAGNETIC UPFLOWS IN GRANULAR CELLS OBSERVED WITH SUNRISE/IMAX
Borrero, J. M.,Martí,nez-Pillet, V.,Schlichenmaier, R.,Solanki, S. K.,Bonet, J. A.,del Toro Iniesta, J. C.,Schmidt, W.,Barthol, P.,Gandorfer, A.,Domingo, V.,Knö,lker, M. IOP Publishing 2010 ASTROPHYSICAL JOURNAL LETTERS - Vol.723 No.2
Solar Magnetoconvection and Small-Scale Dynamo : Recent Developments in Observation and Simulation
Borrero, J. M.,Jafarzadeh, S.,Schü,ssler, M.,Solanki, S. K. Springer-Verlag 2017 Space science reviews Vol.210 No.1
<P>A number of observational and theoretical aspects of solar magnetoconvection are considered in this review. We discuss recent developments in our understanding of the small-scale structure of the magnetic field on the solar surface and its interaction with convective flows, which is at the centre of current research. Topics range from plage areas in active regions over the magnetic network shaped by supergranulation to the ubiquituous 'turbulent' internetwork fields. On the theoretical side, we focus upon magnetic field generation by small-scale dynamo action.</P>
Magnetic fields of opposite polarity in sunspot penumbrae
Franz, M.,Collados, M.,Bethge, C.,Schlichenmaier, R.,Borrero, J. M.,Schmidt, W.,Lagg, A.,Solanki, S. K.,Berkefeld, T.,Kiess, C.,Rezaei, R.,Schmidt, D.,Sigwarth, M.,Soltau, D.,Volkmer, R.,von der Luhe, EDP Sciences 2016 Astronomy and astrophysics Vol.596 No.-
Strain-Induced Spin States in Atomically Ordered Cobaltites
Choi, Woo Seok,Kwon, Ji-Hwan,Jeen, Hyoungjeen,Hamann-Borrero, Jorge E.,Radi, Abdullah,Macke, Sebastian,Sutarto, Ronny,He, Feizhou,Sawatzky, George A.,Hinkov, Vladimir,Kim, Miyoung,Lee, Ho Nyung American Chemical Society 2012 NANO LETTERS Vol.12 No.9
<P>Epitaxial strain imposed in complex oxide thin films by heteroepitaxy is recognized as a powerful tool for identifying new properties and exploring the vast potential of materials performance. A particular example is LaCoO<SUB>3</SUB>, a zero spin, nonmagnetic material in the bulk, whose strong ferromagnetism in a thin film remains enigmatic despite a decade of intense research. Here, we use scanning transmission electron microscopy complemented by X-ray and optical spectroscopy to study LaCoO<SUB>3</SUB> epitaxial thin films under different strain states. We observed an unconventional strain relaxation behavior resulting in stripe-like, lattice modulated patterns, which did not involve uncontrolled misfit dislocations or other defects. The modulation entails the formation of ferromagnetically ordered sheets comprising intermediate or high spin Co<SUP>3+</SUP>, thus offering an unambiguous description for the exotic magnetism found in epitaxially strained LaCoO<SUB>3</SUB> films. This observation provides a novel route to tailoring the electronic and magnetic properties of functional oxide heterostructures.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2012/nalefd.2012.12.issue-9/nl302562f/production/images/medium/nl-2012-02562f_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl302562f'>ACS Electronic Supporting Info</A></P>