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Michael Foerster, Ferran Macià, Nahuel Statuto, Simone Finizio, Alberto Hernández-Mínguez, Sergi Lendínez, Paulo V Santos, Josep Fontcuberta, Joan Manel Hernàndez, Mathias Kläui, Lucia Aballe
The magnetoelastic effect-the change of magnetic properties caused by the elastic deformation of a magnetic material-has been proposed as an alternative approach to magnetic fields for the low-power control of magnetization states of nanoelements since it avoids charge currents, which entail ohmic losses. Here, we have studied the effect of dynamic strain accompanying a surface acoustic wave on magnetic nanostructures in thermal equilibrium. We have developed an experimental technique based on stroboscopic X-ray microscopy that provides a pathway to the quantitative study of strain waves and magnetization at the nanoscale...
September 1, 2017: Nature Communications
C Gutt, T Sant, D Ksenzov, F Capotondi, E Pedersoli, L Raimondi, I P Nikolov, M Kiskinova, S Jaiswal, G Jakob, M Kläui, H Zabel, U Pietsch
We report the results of resonant magnetic XUV reflectivity experiments performed at the XUV free-electron laser FERMI. Circularly polarized XUV light with the photon energy tuned to the Fe M2,3 edge is used to measure resonant magnetic reflectivities and the corresponding Q-resolved asymmetry of a Permalloy/Ta/Permalloy trilayer film. The asymmetry exhibits ultrafast changes on 240 fs time scales upon pumping with ultrashort IR laser pulses. Depending on the value of the wavevector transfer Qz , we observe both decreasing and increasing values of the asymmetry parameter, which is attributed to ultrafast changes in the vertical spin and charge density profiles of the trilayer film...
September 2017: Structural Dynamics (Melville, N.Y.)
Zhaoyang Liu, Hai I Wang, Akimitsu Narita, Qiang Chen, Zoltan Mics, Dmitry Turchinovich, Mathias Kläui, Mischa Bonn, Klaus Müllen
Stimuli-responsive micro-supercapacitors (MSCs) controlled by external stimuli can enable a wide range of applications for future on-chip energy storage. Here, we report on a photoswitchable MSC based on a diarylethene-graphene composite film. The microdevice delivers an outstanding and reversible capacitance modulation of up to 20%, demonstrating a prototype photoswitchable MSC. Terahertz spectroscopy indicates that the photoswitching of the capacitance is enabled by the reversible tuning of interfacial charge injection into diarylethene molecular orbitals, as a consequence of charge transfer at the diarylethene-graphene interface upon light modulation...
July 19, 2017: Journal of the American Chemical Society
Zongping Chen, Hai I Wang, Nerea Bilbao, Joan Teyssandier, Thorsten Prechtl, Nicola Cavani, Alexander Tries, Roberto Biagi, Valentina De Renzi, Xinliang Feng, Mathias Kläui, Steven De Feyter, Mischa Bonn, Akimitsu Narita, Klaus Müllen
Bottom-up synthesis of low-bandgap graphene nanoribbons with various widths is of great importance for their applications in electronic and optoelectronic devices. Here we demonstrate a synthesis of N = 5 armchair graphene nanoribbons (5-AGNRs) and their lateral fusion into wider AGNRs, by a chemical vapor deposition method. The efficient formation of 10- and 15-AGNRs is revealed by a combination of different spectroscopic methods, including Raman and UV-vis-near-infrared spectroscopy as well as by scanning tunneling microscopy...
July 19, 2017: Journal of the American Chemical Society
Joel Cramer, Er-Jia Guo, Stephan Geprägs, Andreas Kehlberger, Yurii P Ivanov, Kathrin Ganzhorn, Francesco Della Coletta, Matthias Althammer, Hans Huebl, Rudolf Gross, Jürgen Kosel, Mathias Kläui, Sebastian T B Goennenwein
We investigate the generation of magnonic thermal spin currents and their mode selective spin transport across interfaces in insulating, compensated ferrimagnet/normal metal bilayer systems. The spin Seebeck effect signal exhibits a nonmonotonic temperature dependence with two sign changes of the detected voltage signals. Using different ferrimagnetic garnets, we demonstrate the universality of the observed complex temperature dependence of the spin Seebeck effect. To understand its origin, we systematically vary the interface between the ferrimagnetic garnet and the metallic layer, and by using different metal layers we establish that interface effects play a dominating role...
June 14, 2017: Nano Letters
Zongping Chen, Hai I Wang, Joan Teyssandier, Kunal S Mali, Tim Dumslaff, Ivan Ivanov, Wen Zhang, Pascal Ruffieux, Roman Fasel, Hans Joachim Räder, Dmitry Turchinovich, Steven De Feyter, Xinliang Feng, Mathias Kläui, Akimitsu Narita, Mischa Bonn, Klaus Müllen
Recent advances in bottom-up synthesis of atomically defined graphene nanoribbons (GNRs) with various microstructures and properties have demonstrated their promise in electronic and optoelectronic devices. Here we synthesized N = 9 armchair graphene nanoribbons (9-AGNRs) with a low optical band gap of ∼1.0 eV and extended absorption into the infrared range by an efficient chemical vapor deposition process. Time-resolved terahertz spectroscopy was employed to characterize the photoconductivity in 9-AGNRs and revealed their high intrinsic charge-carrier mobility of approximately 350 cm2 ·V-1 ·s-1 ...
March 15, 2017: Journal of the American Chemical Society
André Bisig, Collins Ashu Akosa, Jung-Hwan Moon, Jan Rhensius, Christoforos Moutafis, Arndt von Bieren, Jakoba Heidler, Gillian Kiliani, Matthias Kammerer, Michael Curcic, Markus Weigand, Tolek Tyliszczak, Bartel Van Waeyenberge, Hermann Stoll, Gisela Schütz, Kyung-Jin Lee, Aurelien Manchon, Mathias Kläui
We present a combined theoretical and experimental study, investigating the origin of the enhanced nonadiabaticity of magnetic vortex cores. Scanning transmission x-ray microscopy is used to image the vortex core gyration dynamically to measure the nonadiabaticity with high precision, including a high confidence upper bound. We show theoretically, that the large nonadiabaticity parameter observed experimentally can be explained by the presence of local spin currents arising from a texture induced emergent Hall effect...
December 30, 2016: Physical Review Letters
V Mahesh Krishnan, Hadi D Arman, Zachary J Tonzetich
A series of new {Ru-NO}6 complexes containing Kläui's tripodal oxygen ligand, [CpCo{P(O)(OMe)2 }3 ]- (LOMe ), and substituted catecholates have been prepared by chloride exchange with [Ru(LOMe )(NO)Cl2 ]. The [Ru(LOMe )(NO)(cat)] complexes (cat = dianion of catechol, 3,5-di-tert-butylcatechol, tetrabromocatechol, or 2,3-dihydroxynaphthalene) demonstrate spectroscopic features and redox properties consistent with the electronic character of the catecholate ligands. Several of the compounds display reversible oxidation events by cyclic voltammetry arising from the redox non-innocence of the catecholate ligands...
January 24, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
A Pfeiffer, R M Reeve, M Voto, W Savero-Torres, N Richter, L Vila, J P Attané, L Lopez-Diaz, Mathias Kläui
We investigate the pure spin-current assisted depinning of magnetic domain walls in half ring based Py/Al lateral spin valve structures. Our optimized geometry incorporating a patterned notch in the detector electrode, directly below the Al spin conduit, provides a tailored pinning potential for a transverse domain wall and allows for a precise control over the magnetization configuration and as a result the domain wall pinning. Due to the patterned notch, we are able to study the depinning field as a function of the applied external field for certain applied current densities and observe a clear asymmetry for the two opposite field directions...
March 1, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Zongping Chen, Wen Zhang, Carlos-Andres Palma, Alberto Lodi Rizzini, Bilu Liu, Ahmad Abbas, Nils Richter, Leonardo Martini, Xiao-Ye Wang, Nicola Cavani, Hao Lu, Neeraj Mishra, Camilla Coletti, Reinhard Berger, Florian Klappenberger, Mathias Kläui, Andrea Candini, Marco Affronte, Chongwu Zhou, Valentina De Renzi, Umberto Del Pennino, Johannes V Barth, Hans Joachim Räder, Akimitsu Narita, Xinliang Feng, Klaus Müllen
Graphene nanoribbons (GNRs), quasi-one-dimensional graphene strips, have shown great potential for nanoscale electronics, optoelectronics, and photonics. Atomically precise GNRs can be "bottom-up" synthesized by surface-assisted assembly of molecular building blocks under ultra-high-vacuum conditions. However, large-scale and efficient synthesis of such GNRs at low cost remains a significant challenge. Here we report an efficient "bottom-up" chemical vapor deposition (CVD) process for inexpensive and high-throughput growth of structurally defined GNRs with varying structures under ambient-pressure conditions...
November 30, 2016: Journal of the American Chemical Society
Nicole M A Krekel, Max H Haloua, Alexander M F Lopes Cardozo, Roos H de Wit, Anne Marie Bosch, Louise M de Widt-Levert, Sandra Muller, Henk van der Veen, Elisabeth Bergers, Elly S M de Lange de Klerk, Sybren Meijer, M Petrousjka van den Tol
BACKGROUND: Breast-conserving surgery for palpable breast cancer is associated with tumour-involved margins in up to 41% of cases and excessively large excision volumes. Ultrasound-guided surgery has the potential to resolve both of these problems, thereby improving surgical accuracy for palpable breast cancer. We aimed to compare ultrasound-guided surgery with the standard for palpable breast cancer-palpation-guided surgery-with respect to margin status and extent of healthy breast tissue resection...
January 2013: Lancet Oncology
Leo D Roorda, John Green, Kiki R A De Kluis, Ivo W Molenaar, Pam Bagley, Jane Smith, Alexander C H Geurts
OBJECTIVE: To investigate the cross-cultural validity of international Dutch-English comparisons when using the Dutch Rivermead Mobility Index (RMI), and the intra-test reliability and construct validity of the Dutch RMI. METHODS: Cross-cultural validity was studied in a combined data-set of Dutch and English patients undergoing rehabilitation after stroke, who were assessed with the Dutch version of the RMI and the original English RMI, respectively. Mokken scale analysis was used to investigate unidimensionality, monotone homogeneity model fit, and differential item functioning between the Dutch and the English RMI...
October 2008: Journal of Rehabilitation Medicine
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