Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > A material with promising properties: Konstanz scientist synthesizes an important ferromagnetic semiconductor

icture of a hybrid particle taken by a transmission electron microscope. Pictured are the inorganic (dark) and organic (light) lamellas that the particle is made of, as well as the tubular shapes (the low-contrast area in the middle). Through vaporisation with Europium, the hybrid stage can be transformed into pure EuO. 
Copyright: University of Konstanz
icture of a hybrid particle taken by a transmission electron microscope. Pictured are the inorganic (dark) and organic (light) lamellas that the particle is made of, as well as the tubular shapes (the low-contrast area in the middle). Through vaporisation with Europium, the hybrid stage can be transformed into pure EuO. Copyright: University of Konstanz

Abstract:
The Collaborative Research Centre CRC 1214 at the University of Konstanz has developed a method for synthesising Europium (II) oxide nanoparticles - a ferromagnetic semiconductor that is relevant for data storage and data transport

A material with promising properties: Konstanz scientist synthesizes an important ferromagnetic semiconductor

Konstanz, Germany | Posted on November 25th, 2017

Ferromagnetic semiconductors have attracted increasing attention over the last decade. Their properties make them promising functional materials that can be used in the field of spin-based electronics (spintronics). Spintronics is of crucial importance for the storage and transport of information. In an interdisciplinary collaboration, researchers at the University of Konstanz successfully developed a method for synthesising Europium(II) oxide (EuO) nanoparticles, a ferromagnetic semiconductor with extremely promising properties. The researchers also demonstrated that the nanoparticles have magnetic properties because of their structure. The results of the joint research project have been published in the 20 November 2017 issue of the scientific journal Advanced Materials.

The collaboration of the research groups led by Professor Sebastian Polarz (inorganic chemistry), Professor Mikhail Fonin (experimental physics) and Professor Ulrich Nowak (theoretical physics) from the University of Konstanz, as well as the electron microscopy team of the Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden) headed by Dr Axel Lubk, was carried out within the framework of the University of Konstanz's Collaborative Research Centre (SFB) "Anisotropic Particles as Building Blocks: Tailoring Shape, Interactions and Structures". "Without the cooperation of these research teams, we could not have achieved these results", says Bastian Trepka, lead author of the study and a member of Sebastian Polarz's research team Functional Inorganic Materials, where the nanoparticles have been synthesized.

The properties of anisotropic and magnetic nanoparticles are at the centre of the research project A5 of the SFB. Anisotropic means that the shape and the magnetic, optical or electronic properties are not identical for all spatial directions of the particle. This in turn makes it possible to investigate not only the new and often improved properties of nano-structured materials, but also the additional properties caused by anisotropy.

Producing nanoparticles from ferromagnetic semiconductors such as Europium(II) oxide constitutes a huge challenge, especially in anisotropic geometry. After all, the particles with the expected new interesting properties are to be anisotropic, too. "The aim is to deepen our understanding so that we can modulate and access the properties of nano-systems on demand", says lead author Trepka. Using their special method, the researchers succeeded in producing high-quality and anisotropic EuO-nanoparticles that can be used to observe structure property effects.

The method is based on a two-stage process. In a first step, a hybrid material consisting of organic and inorganic components is produced, which is already anisotropic. In the next step, the hybrid material is treated with europium vapour. As a result, it chemically converts to EuO. In this case the nanoparticles' shape is tubular. "This method is interesting because it is not limited to tubular forms. It is also possible to produce rods", explains Bastian Trepka.

Furthermore, the researchers were able to demonstrate that the magnetic properties of the semiconductor Europium(II) oxide are actually related to the shape of its nanostructure, or rather the anisotropy. After further treatment while trying to generate counter-evidence, the tubular shapes disappeared, resulting in different properties. "The experimental physicists carried out measurements that confirmed the results that had been simulated by the theoretical physicists. This enabled us to develop ideas as to how the structure brings about this particular magnetic behaviour", explains Bastian Trepka.

"What is really special about our process is the separation of structure control and chemical transformation. We can obtain different shapes from the same material by influencing the shape through process control. This way we will always get the material to assume the shape we need", says Trepka. In the case of Europium(II) oxide, this is a topotactic nanotransformation that maintains its crystalline direction: it is tubular both before and after treatment.

"An intelligent material with a variety of properties", says Bastian Trepka of Europium(II) oxide. Above all, it has a simple crystalline structure. "We can explain changes in properties with appeal to the crystalline structures, which are pre-determined". This is ideal for basic research.

###

Facts:

Project of the University of Konstanz's Collaborative Research Centre "Anisotropic Particles as Building Blocks: Tailoring Shape, Interactions and Structures"
The CRC is funded by the German Research Foundation (DFG) with approximately 7.5 million euros.
It commenced its work on 1 July 2016.
The CRC is comprised of 15 projects as well as a centre for particle analysis.
Participating research groups: Functional Inorganic Materials, led by Professor Sebastian Polarz, Magnetic Materials and Spintronics, led by Professor Mikhail Fonin, and Magnetic Materials: Theory and Simulation, led by Professor Ulrich Nowak from the University of Konstanz, as well as the Advanced Methods of Electron Microscopy working group at the Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden), headed by Dr Axel Lubk.
Bastian Trepka is a doctoral researcher in Sebastian Polarz's working group, writing his doctoral thesis on magnetic metal/iron oxide nanoparticles.

####

For more information, please click here

Contacts:
University of Konstanz
Communications and Marketing
Phone: + 49 7531 88-3603


Media Contact

Julia Wandt

Copyright © University of Konstanz

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

Original publication: Bastian Trepka, Philipp Erler, Severin Selzer, Tom Kollek, Klaus Boldt, Mikhail Fonin, Ulrich Nowak, Daniel Wolf, Axel Lubk, Sebastian Polarz: Nanomorphology Effects in Semiconductors with Native Ferromagnetism: Hierarchical Europium (II) Oxide Tubes Prepared via a Topotactic Nanostructure Transition. Advanced Materials, 20 November 2017:

Related News Press

News and information

Switching with molecules: Molecular switch will facilitate the development of pioneering electro-optical devices May 25th, 2018

Tunable diamond string may hold key to quantum memory: A process similar to guitar tuning improves storage time of quantum memory May 24th, 2018

Remote control of transport through nanopores: New study outlines key factors affecting the transfer of molecules through biological channels May 24th, 2018

2018 Kavli Prizes in Astrophysics, Nanoscience, and Neuroscience to be Announced Live on May 31: Live announcement at the Norwegian Academy of Science and Letters to be streamed live at World Science Festival Event May 24th, 2018

Magnetism

Piezomagnetic material changes magnetic properties when stretched March 22nd, 2018

Unexpected effect could lead to lower-power memory, computing devices March 17th, 2018

Oxford Instruments announces Dr Kate Ross as winner of the 2018 Lee Osheroff Richardson Science Prize for North and South America February 20th, 2018

Fast-spinning spheres show nanoscale systems' secrets: Rice University lab demonstrates energetic properties of colloids in spinning magnetic field February 7th, 2018

Possible Futures

Switching with molecules: Molecular switch will facilitate the development of pioneering electro-optical devices May 25th, 2018

Tunable diamond string may hold key to quantum memory: A process similar to guitar tuning improves storage time of quantum memory May 24th, 2018

Remote control of transport through nanopores: New study outlines key factors affecting the transfer of molecules through biological channels May 24th, 2018

'Spooky action at a distance': Researchers develop module for quantum repeater May 23rd, 2018

Chip Technology

Switching with molecules: Molecular switch will facilitate the development of pioneering electro-optical devices May 25th, 2018

Columbia Researchers Squeeze Light into Nanoscale Devices and Circuits: Team is first to directly image propagation and dynamics of graphene plasmons at very low temperatures; findings could impact optical communications and signal processing May 23rd, 2018

Supersonic waves may help electronics beat the heat May 18th, 2018

Deeper understanding of quantum chaos may be the key to quantum computers May 16th, 2018

Memory Technology

Tunable diamond string may hold key to quantum memory: A process similar to guitar tuning improves storage time of quantum memory May 24th, 2018

A powerful laser breakthrough: Lehigh research team demonstrates terahertz semiconductor laser with record-high output power May 2nd, 2018

Researchers develop nanoparticle films for high-density data storage: April 3rd, 2018

Design approach developed for important new catalysts for energy conversion and storage: New method could aid in design of pharmaceuticals and optical and data storage materials March 21st, 2018

Materials/Metamaterials

Making carbon nanotubes as usable as common plastics: Researchers discover that cresols disperse carbon nanotubes at unprecedentedly high concentrations May 15th, 2018

Mining for gold with a computer: Texas A&M team gleans new insights on key material May 3rd, 2018

'Exceptional' research points way toward quantum discoveries: Rice University scientists make tunable light-matter couplings in nanotube films April 30th, 2018

The first PE blown films with nanotubes hit the Chinese market April 26th, 2018

Announcements

Switching with molecules: Molecular switch will facilitate the development of pioneering electro-optical devices May 25th, 2018

Tunable diamond string may hold key to quantum memory: A process similar to guitar tuning improves storage time of quantum memory May 24th, 2018

Remote control of transport through nanopores: New study outlines key factors affecting the transfer of molecules through biological channels May 24th, 2018

2018 Kavli Prizes in Astrophysics, Nanoscience, and Neuroscience to be Announced Live on May 31: Live announcement at the Norwegian Academy of Science and Letters to be streamed live at World Science Festival Event May 24th, 2018

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

Switching with molecules: Molecular switch will facilitate the development of pioneering electro-optical devices May 25th, 2018

Tunable diamond string may hold key to quantum memory: A process similar to guitar tuning improves storage time of quantum memory May 24th, 2018

Remote control of transport through nanopores: New study outlines key factors affecting the transfer of molecules through biological channels May 24th, 2018

'Spooky action at a distance': Researchers develop module for quantum repeater May 23rd, 2018

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project