Welcome to the homepage of the magnetism group!

Announcements

Upcoming talk in our Group seminar:

"Spin-Transfer torque effects in CMFS/Pt waveguides" by Thomas Meyer on Monday, May 11th, 11:00 in room 56-415.

Guests are, as always, very much welcome.

 

News

5-2015

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.

 

2-2015

 

STeP conclusion meeting

Photo from left to right: Dr. F. Casper (Uni Mainz), Dr. R. Lehndorff (Sensitec), Dr. M. Dorms (Sensitec), Prof. Dr. M. Kläui (Uni Mainz), the Minister of Rhineland-Palatinate V. Reiß (MBWWK), Dr. A. Conca (TU Kaiserslautern), J. Rühl (LTI Drives), Dr. B. Leven (TU Kaiserslautern), Prof. Dr. B. Hillebrands (TU Kaiserslautern), Dr. J. Gerber (director of the magnetic industry association INNOMAG), Dr. R. Slatter (Sensitec, CEO).

 

The conclusion meeting for the Spin Technology Platform (STeP) took place on February, 12, at the facilities of our industrial collaborator Sensitec in Mainz. Together with the Johannes Gutenberg University in Mainz, STeP aims to the development of new concepts and measurement methods for the magnetic sensor technology. STeP is a clear example of technology transfer between universities and industries, where relevant results on lab level are prepared to be converted into real applications. The magnetic sensor technology finds application in the automotive industry, in robotics or for industrial automation processes.

During the meeting, the main scientific results were presented to a delegation of people from the industry and politics. In the center of the photo above, a model of the elevators system of the Taipei building in Taiwan is shown. This model explains an example of a real application of magnetic sensors for positioning and contains the same sensors used in the actual building in Taipei (courtesy of ELGO Electronics, developer of this system).

In addition, the partner project TT-DINEMA (Technology Transfer Service Centre for New Materials) was also presented. The aim of the TT-DINEMA project is to establish a service center for new material concepts for various fields, ranging from solar technology through medical technology to thermoelectrics.

For more information: www.uni-kl.de/aktuelles/news/article/abschluss-des-grossf/

 

 

News Archive

 

Recent Publications

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)

Non-Gilbert-damping Mechanism in a Ferromagnetic Heusler Compound Probed by Nonlinear Spin Dynamics
P. Pirro, T. Sebastian, T. Brächer, A.A. Serga, T. Kubota, H. Naganuma, M. Oogane, Y. Ando, and B. Hillebrands
Phys. Rev. Lett. 113, 227601 (2014)

Design of a spin-wave majority gate employing mode selection
S. Klingler, P. Pirro, T. Brächer, B. Leven, B. Hillebrands and A. V. Chumak
Appl. Phys. Lett. 105, 152410 (2014)

Magnon transistor for all-magnon data processing
A. V. Chumak, A. A. Serga, and B. Hillebrands
Nat. Commun. 5:4700 (2014)

Topical Review: The 2014 Magnetism Roadmap
R. L. Stamps, S. Breitkreutz, J. Åkerman, A. V. Chumak, Y. Otani, G. E. W. Bauer, J.-U. Thiele, M. Bowen, S. A. Majetich, M. Kläui, I. L. Prejbeanu, B. Dieny, N. M. Dempsey, and B. Hillebrands
J. Phys. D: Appl. Phys. 47, 333001 (2014)