Magnetoelectric effect; X-ray diffraction; Multipole expansion; Multiferroics; Magnetism; Strong electronic correlations; Nonlinear optics; Density functional theory
Ramakrishnan Mahesh, Constable Evan, Cano Andres, Mostovoy Maxim, White Jonathan S., Gurung Namrata, Schierle Enrico, Brion Sophie de, Colin Claire V., Gay Frederic, Lejay Pascal, Ressouche Eric, Weschke Eugen, Scagnoli Valerio, Ballou Rafik, Simonet Virginie, Staub Urs (2019), Field-induced double spin spiral in a frustrated chiral magnet, in npj Quantum Materials
, 4(1), 60-60.
Mukherjee Saumya, Shimamoto Kenta, Windsor Yoav William, Ramakrishnan Mahesh, Parchenko Sergii, Staub Urs, Chapon Laurent, Ouladdiaf Bachir, Medarde Marisa, Shang Tian, Müller Elisabeth A., Kenzelmann Michel, Lippert Thomas, Schneider Christof W., Niedermayer Christof (2018), Multiferroic phase diagram of E -type RMnO3 films studied by neutron and x-ray diffraction, in Physical Review B
, 98(17), 174416-174416.
Esposito Vincent, Rettig Laurenz, Bothschafter Elisabeth M., Deng Yunpei, Dornes Christian, Huber Lucas, Huber Tim, Ingold Gerhard, Inubushi Yuichi, Katayama Tetsuo, Kawaguchi Tomoya, Lemke Henrik, Ogawa Kanade, Owada Shigeki, Radovic Milan, Ramakrishnan Mahesh, Ristic Zoran, Scagnoli Valerio, Tanaka Yoshikazu, Togashi Tadashi, Tono Kensuke, Usov Ivan, Windsor Yoav W., Yabashi Makina, Johnson Sten L., BeaudPaul, StaubUrs (2018), Dynamics of the photoinduced insulator-to-metal transition in a nickelate film, in Structural Dynamics
, 5(6), 064501-064501.
Thöle Florian, Spaldin Nicola A. (2018), Magnetoelectric multipoles in metals, in Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
, 376(2134), 20170450-20170450.
Fedorova Natalya S., Windsor Yoav William, Findler Christoph, Ramakrishnan Mahesh, Bortis Amadé, Rettig Laurenz, Shimamoto Kenta, Bothschafter Elisabeth M., Porer Michael, Esposito Vincent, Hu Yi, Alberca Aurora, Lippert Thomas, Schneider Christof W., Staub Urs, Spaldin Nicola A. (2018), Relationship between crystal structure and multiferroic orders in orthorhombic perovskite manganites, in Physical Review Materials
, 2(10), 104414-104414.
De Luca Gabriele, Strkalj Nives, Manz Sebastian, Bouillet Corinne, Fiebig Manfred, Trassin Morgan (2017), Nanoscale design of polarization in ultrathin ferroelectric heterostructures, in Nature Communications
, 8(1), 1419-1419.
E. M. Bothschafter, E. Abreu, L. Rettig, T. Kubacka, S. Parchenko, M. Porer, C. Dornes, Y. W. Windsor, M. Ramakrishnan, A. Alberca, S. Manz, J. Saari, S. M. Koohpayeh, M. Fiebig, T. Forrest, P. Werner, S. S. Dhesi, S. L. Sohnson, U. Staub (2017), Dynamic pathway of the photoinduced phase transition in TbMnO3, in Physical Review B
, 96, 184414.
U. Staub, L. Rettig, E. M. Bothschafter, Y. W. Windsor, M. Ramakrishnan, S. R. V. Avula, J. Dreiser, C. Piamonteze, V. Scagnoli, S. Mukherjee, C. Niedermayer, M. Medarde, E. Pomjakushina (2017), Interplay of Fe and Tm moments through the spin-reorientation transition in TmFeO3, in Physical Review B
, 96, 174408-11.
Windsor Y. W., Piamonteze C., Ramakrishnan M., Scaramucci A., Rettig L., Huever J. A., Bothschafter E. M., Bingham N. S., Alberca A., Avula S. R. V., Noheda B., Staub U. (2017), Magnetic properties of strained multiferroic CoCr2O4: A soft x-ray study, in PHYSICAL REVIEW B
, 95(22), 224413.
Ramakrishnan M., Joly Y., Windsor Y. W., Rettig L., Alberca A., Bothschafter E. M., Lejay P., Ballou R., Simonet V., Scagnoli V., Staub U. (2017), Crystal symmetry lowering in chiral multiferroic Ba3TaFe3Si2O14 observed by x-ray magnetic scattering, in PHYSICAL REVIEW B
, 95(20), 205145.
De Luca Gabriele, Rossell Marta D., Schaab Jakob, Viart Nathalie, Fiebig Manfred, Trassin Morgan (2017), Domain Wall Architecture in Tetragonal Ferroelectric Thin Films, in Advanced Materials
, 29(7), 1605145-1605145.
Thöle Florian, Fechner Michael, Spaldin Nicola A. (2016), First-principles calculation of the bulk magnetoelectric monopole density: Berry phase and Wannier function approaches, in Physical Review B
, 93(19), 195167.
Shimamoto K., Windsor Y. W., Hu Y., Ramakrishnan M., Alberca A., Bothschafter E. M., Rettig L., Lippert Th., Staub U., Schneider C. W. (2016), Multiferroic properties of uniaxially compressed orthorhombic HoMnO3 thin films, in APPLIED PHYSICS LETTERS
, 108(11), 4944460.
Fechner Michael, Fierz Merlin J.A., Thöle Florian, Staub Urs, Spaldin Nicola A. (2016), Quasistatic magnetoelectric multipoles as order parameter for pseudogap phase in cuprate superconductors, in Physical Review B
, 93(17), 174419.
Fiebig Manfred, Lottermoser Thomas, Meier Dennis, Trassin Morgan (2016), The evolution of multiferroics, in Nature Reviews Materials
, 1, 16046.
Alberca A., Uribe-Laverde M. A., Windsor Y. W., Ramakrishnan M., Rettig L., Marozau I., Tonnerre J-M., Stahn J., Staub U., Bernhard C. (2015), Element-specific magnetization redistribution at YBa2Cu3O7/La2/3Ca1/3MnO3 interfaces, in PHYSICAL REVIEW B
, 92(17), 174415.
Lovesey S. W., Khalyavin D. D., Staub U. (2015), Ferro-type order of magneto-electric quadrupoles as an order-parameter for the pseudo-gap phase of a cuprate superconductor, in JOURNAL OF PHYSICS-CONDENSED MATTER
, 27(29), 1-5.
Windsor Y. W., Ramakrishnan M., Rettig L., Alberca A., Bothschafter E. M., Staub U., Shimamoto K., Hu Y., Lippert T., Schneider C. W. (2015), Interplay between magnetic order at Mn and Tm sites alongside the structural distortion in multiferroic films of o-TmMnO3, in PHYSICAL REVIEW B
, 91(23), 235144.
Johnson J. A., Kubacka T., Hoffmann M. C., Vicario C., de Jong S., Beaud P., Gruebel S., Huang S. -W., Huber L., Windsor Y. W., Bothschafter E. M., Rettig L., Ramakrishnan M., Alberca A., Patthey L., Chuang Y. -D., Turner J. J., Dakovski G. L., Lee W. -S., Minitti M. P., Schlotter W., Moore R. G., Hauri C. P., Koohpayeh S. M., Scagnoli V. (2015), Magnetic order dynamics in optically excited multiferroic TbMnO3, in PHYSICAL REVIEW B
, 92(18), 184429.
Toledano P., Ackermann M., Bohaty L., Becker P., Lorenz T., Leo N., Fiebig M. (2015), Primary ferrotoroidicity in antiferromagnets, in PHYSICAL REVIEW B
, 92(9), 094431.
Trassin Morgan, De Luca Gabriele, Manz Sebastian, Fiebig Manfred (2015), Probing Ferroelectric Domain Engineering in BiFeO3 Thin Films by Second Harmonic Generation, in Advanced Materials
, 27, 4871-4876.
Zimmermann Anne S., Meier Dennis, Fiebig Manfred (2014), Ferroic nature of magnetic toroidal order, in NATURE COMMUNICATIONS
, 5, 4796.
Fechner Michael, Spaldin Nicola A., Dzyaloshinskii Igor E. (2014), Magnetic field generated by a charge in a uniaxial magnetoelectric material, in PHYSICAL REVIEW B
, 89(18), 184415.
Spaldin Nicola A., Fechner Michael, Bousquet Eric, Balatsky Alexander, Nordström Lars (2013), Monopole-based formalism for the diagonal magnetoelectric response, in PHYSICAL REVIEW B
, 88(9), 094429.
The search for novel states of matter and new types of order is one of the most exciting and fundamental aspects of modern condensed matter physics. Often such states remain hidden for a long time because there is no direct experimental manifestation of their existence. For example, ferromagnetism has been known for millennia whereas antiferromagnetism, in spite of being more common, was discovered barely 70 years ago. Presently, two states of matter that had remained elusive for decades are intensely discussed: toroidal moments and magnetic monopoles. The former describes a magnetic vortex which may be represented classically by a solenoid bent into a torus or quantum-mechanically by a circular arrangement of spins or a particle called an anapole. The latter is the magnetic counterpart of an electric charge, colloquially speaking a north pole separated from the south pole of a magnet. It is the goal of our proposal to detect local as well as nonlocal manifestations of toroidal and magnetic-monopole moments in condensed matter systems. We will discuss the microscopic origin of the two phenomena but also the macroscopic physical properties they are related to. In particular we will search for novel forms of long-range order characterized by the spontaneous and uniform orientation of toroidal or magnetic-monopole moments. Although toroidal moments and magnetic monopoles have been considered as disjunct topics so far, they are in fact very closely related. The linke is that both are consequences of simultaneously broken spatial and temporal inversion symmetry and therefore inherently related to the magnetoelectric effect (a magnetization induced by an electric field and an electric polarization induced by a magnetic field). Therefore, it is another goal of our work to establish toroidal moments and magnetic monopoles as closely related complementary phenomena. Three teams will constitute the Sinergia collaboration. First, the group of M. Fiebig, ETH Zurich, will investigate macroscopic manifestations of toroidal moments and magnetic monopoles using nonlinear optics and magnetoelectric current measurements as detection techniques. Second, the group of U. Staub, PSI Villigen, will probe the related microscopic electronic interactions by using x-ray diffraction techniques. Third, the group of N. A. Spaldin, ETH Zurich, will develop the theory of toroidal moments and magnetic monopoles, and investigate their electronic origin and possible long-range order by density functional theory. With our Sinergia work we will investigate fundamental questions regarding the symmetry and structure of matter. On the other hand, a perspective on applications is also involved because of the magnetoelectric effect - and consequently the potential to control magnetism by electric fields - inherently related to the presence of toroidal moments and magnetic monopoles.