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7-2015

ICM 2015 Conference, Barcelona

Our PhD student Dmytro Bozhko has been awarded the Best Poster Award of Monday's Session on the ICM 2015 conference in Barcelona. He and his coworkers presented the latest results on their research on Magnon Bose-Einstein condensates.
(Poster Mo. G-P13 - Stimulated thermalization of a parametrically driven magnon gas as a prerequisite for Bose-Einstein magnon condensation, D. A. Bozhko, P. Clausen, V. I. Vasyuchka, B. Hillebrands, G. A. Melkov, A. A. Serga)

 

Awardee Dmytro Bozhko

 

 

6-2015

Preis des Freundeskreises

Dr. Philipp Pirro, who did his PhD in our group, was awarded the "Preis des Freundeskreises" for his outstanding dissertation on the linear and nonlinear interaction of spin waves in magnetic microstructures. The Freundeskreis grants this price to excellent young researchers from all departments.

 

Awardees of the "Preis des Freundeskreises" together with the University's Vice President Arnd Poetzsch-Heffter (fourth from left), and the University's President Helmut J. Schmidt (right). Philipp Pirro: Fourth from right. Photo: Thomas Koziel

 

Our article "Detection of spin waves in permalloy using planar Hall effect" has been accepted for publication in Physical Review Applied.

 

Our article "Experimental observation of the interaction of propagating spin waves with Néel domain walls in a Landau domain structure" has been accepted for publication in Applied Physics Letters.

 

Our article Stimulated Thermalization of a Parametrically Driven Magnon Gas as a Prerequisite for Bose-Einstein Magnon Condensation has been published in Physical Review B.

 

Our review article in Nature Physics on magnon spintronics is online:

Magnon spintronics is the field of spintronics concerned with structures, devices and circuits that use spin currents carried by magnons. The use of magnons allows the implementation of novel wave-based computing technologies free from the drawbacks inherent to modern electronics, such as dissipation of energy due to Ohmic losses. Logic circuits based on wave interference and nonlinear wave interaction can be designed with much smaller footprints compared with conventional electron-based logic circuits.

In our review we introduce the basic properties of magnons and their handling and we discuss the inter-conversion between magnon currents and electron-carried spin and charge currents. In addition, concepts and experimental studies of magnon-based computing circuits are presented.

Magnon spintronics (REVIEW ARTICLE), A.V. Chumak, V.I. Vasyuchka, A.A. Serga and B. Hillebrands, Nature Physics,11, 453 2 JUNE 2015, DOI: 10.1038/NPHYS3347.

 

5-2015

Spin waves in laser-induced patterns

Facile manipulation of spin-wave propagation is a crucial requirement on the way to the realization of spin-wave logic devices. In collaboration with the group of Prof. Georg von Freymann, our group investigated the influence of laser-induced thermal patterns on the spin-wave propagation properties of YIG samples. The results of this work have been published in Nature Physics:

Optically-Reconfigurable Magnetic Materials
M. Vogel, A.V. Chumak, E.H. Waller, T. Langner, V.I. Vasyuchka, B. Hillebrands, and G. von Freymann, Nature Physics (2015)

A press release (in German) is available here.

 

 

Our article Spin-wave logic devices based on isotropic forward volume magneto-static waves has been published in Applied Physics Letters.

 

Our article The role of the non-magnetic material in spin pumping and magnetization dynamics in NiFe and CoFeB multilayer systems has been published in Journal of Applied Physics.

 

4-2015

AG Magnetismus at Hannover Messe 2015

Left: Model of the Taipei 101 building in Taiwan for the demonstration of positioning sensors based on magnetoresistive technologies (Courtesy of ELGO Electronics). Right: Thomas Langner (top) and Dr. Andrés Conca (bottom) discuss with some visitors about the application of magnetic sensors.

As in former years, AG Magnetismus was also recently present at the Hannover Messe, with 220.000 visitors the world’s biggest industrial fair. Together with the Johannes Gutenberg University, we presented our industry-related research and other activities at the stand of the State of Rhineland-Palatinate in the hall for Research & Technology.

We presented the STeP project (Spintronic Technology Platform Rhineland-Palatinate) that was recently successfully concluded. STeP focuses on magnetic sensors for industrial automation, automotive industry or robotics. The project makes use of magnetoresistive technologies for the development of new sensor designs. The main activities are performed at the facilities of Sensitec GmbH in Mainz. Sensitec is a world leader for magnetic sensors and contributes with its expertise and know-how in this field. The project complements the Service Center for New Materials (TT-DINEMA), located at Mainz and also presented in the fair.

In addition, we presented some of our educational activities to students and the general public which take place in the framework of the Magnetism Network of the Great Region (GRMN). In this network, the Universities of Lorraine, Saarland and Kaiserslautern offer joint technology transfer between universities and industry. The education of experts, as well as of the general public is one of the main goals of GRMN. At Hannover, we presented a model of the Taipei 101 tower as demonstrator on how magnetic sensors can solve technological problems and generate new application fields. The demonstrator was produced in collaboration with the company ELGO Electronics, responsible for the elevators' positioning system in the Taipei 101. For the positioning the presented model uses the same sensors as the elevators in the real building.

 

Two of our articles have been published in Journal of Physics D: Applied Physics:

Advancement in Heusler compounds and other spintronics material designs and applications
and
All-optical characterisation of the spintronic Heusler compound Co2Mn0.6Fe0.4Si.

This particular issue is a free issue until July, 13th, 2015!

 

3-2015

Magnonics at CeBIT 2015

The magnon transistor technology can serve as a key feature to enable the development of magnon-based wave logic computing devices.

Our group presented a prototype of such a magnon transistor to the international public at the CeBIT 2015 exhibition, the world's largest trade fair on information technology.

Further information is available at CeBIT 2015: Magnon Transistor

 

Demonstration of the magnon transistor to Prof. Dr. Thomas Deufel, Under-Secretary, Ministery for Education, Science, Further Education and Culture of the State Rhineland-Palatinate:

 

 

Do you want to obtain a general understanding about magnonics, one of our main research topics?
If so, please turn to our recent article in "Physik in unserer Zeit" (in German!):

B. Leven, A. V. Chumak, B. Hillebrands: "Magnonen für den Computer von Übermorgen"

 

 

Our article "A spin-wave logic gate based on a width-modulated dynamic magnonic crystal" has been published in Applied Physics Letters.

 

 

News Archive

 

Recent Publications

Magnon spintronics (Invited Review)
A.V. Chumak, V.I. Vasyuchka, A.A. Serga, and B. Hillebrands
Nature Physics AOP, (2015)

Spin-wave logic devices based on isotropic forward volume magneto-static waves
S. Klingler, P. Pirro, T. Brächer, B. Leven, B. Hillebrands, and A.V. Chumak

Appl. Phys. Lett. 106, 212406 (2015)

Optically-Reconfigurable Magnetic Materials
M. Vogel, A.V. Chumak, E.H. Waller, T. Langner, V.I. Vasyuchka, B. Hillebrands, and G. von Freymann
Nature Physics 11, 487 (2015)

Advancement in Heusler compounds and other spintronics material designs and applications
Shigemi Mizukami and Alexander A. Serga
Journal of Physics D: Applied Physics 48, 160301 (2015)

All-optical characterisation of the spintronic Heusler compound Co2Mn0.6Fe0.4Si
Thomas Sebastian, Yuki Kawada, Björn Obry, Thomas Brächer, Philipp Pirro, Dmytro A. Bozhko, Alexander A. Serga, Hiroshi Naganuma, Mikihiko Oogane, Yasuo Ando, and Burkard Hillebrands
Journal of Physics D: Applied Physics 48, 164015 (2015)

A spin-wave logic gate based on a width-modulated dynamic magnonic crystal
Andrey A. Nikitin, Alexey B. Ustinov, Alexander A. Semenov, Andrii V. Chumak, Alexander A. Serga, Vitaliy I. Vasyuchka, Erkki Lähderanta, Boris A. Kalinikos, and Burkard Hillebrands
Applied Physics Letters 106, 102405 (2015)

Magnonen für den Computer von Übermorgen
B. Leven, A. V. Chumak, B. Hillebrands
Physik in unserer Zeit 46 (2015)

Sign of inverse spin Hall voltages generated by ferromagnetic resonance and temperature gradients in yttrium iron garnet|platinum bilayers
M. Schreier, G. E. W. Bauer, V. I. Vasyuchka, J. Flipse, K. Uchida, J. Lotze, V. Lauer, A. V. Chumak, A. A. Serga, S. Daimon, T. Kikkawa, E. Saitoh, B. J. van Wees, B. Hillebrands, R. Gross, S. T. B. Goennenwein
Journal of Physics D: Applied Physics 48, 025001 (2015)

Measurements of the exchange stiffness of YIG films using broadband ferromagnetic resonance techniques
S. Klingler, A. V. Chumak, T. Mewes, B. Khodadadi, C. Mewes, C. Dubs, O. Surzhenko, B. Hillebrands, A. Conca
Journal of Physics D: Applied Physics 48, 015001 (2015)

Time- and power-dependent operation of a parametric spin-wave amplifier
Thomas Brächer, Frank Heussner, Philipp Pirro, Tobias Fischer, Moritz Geilen, Björn Heinz, Bert Lägel, Alexander Serga, and Burkard Hillebrands
Applied Physics Letters 105, 232409 (2014)