Contact

Prof. Dr. Joachim Wosnitza
Director
Dresden High Magnetic Field Laboratory
j.wosnitzaAthzdr.de
Phone: +49 351 260 - 3524

Julia Blöcker
Secretary/ Administration
j.bloeckerAthzdr.de
Phone: +49 351 260 - 3527
Fax: +49 351 260 - 13527

Scientists@work

This week, we are happy to welcome:

Name: Andreas Rost
University of Stuttgart, Institut für Funktionelle Materie und Quantentechnologien Stuttgart

News

Newsletter: Read the latest news from the four leading high field labs in Europe on the EMFL website.

EMFL News 4/2015

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Vorschau-Bild

Magnetic fields in science and technology

Ferromagnetismus und SupraleitungMaterials research

In nature, the magnetic field acts as a fundamental thermodynamic property like temperature or pressure. For this, the magnetic field plays a decisive role in many facets of nature, and in consequence, is of importance in several natural sciences. In particular, the understanding of magnetic properties of matter and the interplay of magnetism with other quantities is a challenging field of research. Under extreme conditions, like low temperatures, high pressures, and high magnetic fields, new interesting properties of matter can appear and the understanding of materials properties can crucially be gained.


Meissner-Ochsenfeld-EffektVersatile use

Further, the manifold magnetic effects in nature and in particular the magnetic properties of matter are a rich source for technological innovations. Historically, there is an immense number of inventions like the compass, electro motor, generator, relay, magnetic brake, levitating train, nuclear magnetic resonance tomograph, hard disk drive, magneto-electric random access memory. Nowadays, in transport, energy production, medicine, communication, data storage, and other areas of daily live, magnetic systems, components, and properties are used in a large variety.


Research tool

In the last decades, the application of high magnetic fields became a powerful research tool. Especially in solid state physics important discoveries like the integer quantum Hall effect and fractional quantum Hall effect (both honored with the Physics Nobel Prize) as well as appropriate investigations in graphene (Physics Nobel Prize 2010), are based on experiments in very high magnetic fields.


Forschung Populär, Hochfeld-Magnetlabor, Alexandra VyalikhThe HLD

In order to establish a large modern user facility with unique experimental possibilities for science in high magnetic fields and in order to provide an easy access for the high field community in Europe, the Dresden High Field Project has been started. The facility has been built up during 2003 to 2006. Since 2007, the Dresden High Magnetic Field Laboratory (HLD) operates as a user facility for experiments in ultra-high pulsed magnetic fields up to 100 T.


Magnetic fields in laboratories and nature

Technically feasible magnetic fields

MethodField valueDurationLaboratory (assortment)
Intensive laser irradiation of solids (sample is in plasma state) 34 000 T 10 ps  
Explosive flow compression (Experimental set-up will be destroyed) 2 800 T μs Sarov
Electromagnetic flux compression (coil will be destroyed) 620 T μs Tokyo
Coil with one or a few convolutions (will be destroyed) 300 T μs Tokyo, Toulouse, Los Alamos
Pulsed coils 100 T 10-3 to 1 s Dresden (94,2 T), Los Alamos (100 T), Toulouse (82,0 T), Tokyo, Wuhan, Leuven, Oxford
Hybrid magnet (resistive + superconducting) 45 T static Tallahassee
Resistive electro magnets 38 T static Grenoble, Tallahassee, Nijmegen
Superconducting magnet systems (conventional and high temperature-superconductor) 27 T static Tallahassee (achieved in 2015)
Superconducting magnets (conventional) 22 T static commercial
Coils with iron yoke 2 T static commercial

Typical magnet fields in nature

OccurenceField value
Neutron star 108 T
White dwarfs 104 T
Internal exchange fields of ferromagnets 101 to 103 T
Surface of ferromagnets 10-1 to 101 T
Sunspots 10-1 T
Earth 10-5 to 10-4 T
Technical scattering fields "urban noise" 10-12 to 10-5 T
Field in galaxies 10-10 T
Fields in galaxy accumulations 10-10 to 10-13 T
Intergalactic magnetic field 10-13 T
Magnetic fields in biology 10-15 to 10-9 T

Units

  • 1 Tesla = 1 T = 1 Vs/m2
  • SI Unit of the magnetic flux density, named after Nikola Tesla (1856 - 1943), a Serbian-American electrical engineer and physicist
  • 1 Gauss = 1 G = 10-4 T = 0.0001 T
  • This magnetic flux density unit was named after Carl Friedrich Gauß (1777 - 1855), a mathematician, astronomer and physicist who also paved the way for modern earth sciences