Skyrmions

Room Temperature Magnetic Skyrmions in Engineered Multilayer Films

Speaker(s): 
Geoffrey Beach
Dates: 
Friday, April 14, 2017 - 11:30am to 12:30pm

Magnetic skyrmions [1] are particle-like twists of the magnetization taking the form of nanoscale vortices or bubbles that are topologically protected from being continuously ‘unwound’. Their small size, high stability, and ease of manipulation by electric current make them strong candidates for use as information carriers in spintronic memory and logic devices. However, magnetic skyrmions have until recently been restricted to just a few materials and observed only at low temperatures, limiting the experimental accessibility and technological application of these unique...

Magnetic Interface Anisotropy, Domain Walls, and Skyrmions

Speaker(s): 
Vincent Sokalski
Dates: 
Thursday, February 23, 2017 - 4:30pm to 5:30pm

The recently discovered Dzyaloshinskii-Moriya Interaction (DMI) in thin films has spawned a new direction for magnetism in spintronic application. This phenomenon stabilizes topological magnetic features including skyrmions and chiral domain walls (DWs) that can be manipulated by electric current with unprecedented efficiency. In this talk, I will review consequences of DMI on the structure of “Dzyaloshinskii” DWs and introduce the creep scaling law, which is paramount to describing a range of elastic interfaces including also superconductor flux lines and fluids being...

Room Temperature Generation and Manipulation of Magnetic Skyrmions

Speaker(s): 
Axel Hoffmann
Dates: 
Monday, November 14, 2016 - 4:30pm to 6:00pm

The field of spintronics, or magnetic electronics, is maturing and giving rise to new subfields. An important ingredient to the vitality of magnetism research in general is the large complexity due to competitions between interactions crossing many length scales and the interplay of magnetic degrees of freedom with charge (electric currents), phonon (heat), and photons (light). One perfect example, of the surprising new concepts being generated in magnetism research is the recent discovery of magnetic skyrmions. Magnetic skyrmions are topologically distinct...

Skyrmion in Helimagnets

Speaker(s): 
Jiadong Zhang
Dates: 
Thursday, September 29, 2016 - 4:30pm to 5:30pm

Common magnets, such as refrigerator magnets and recorded bits in your hard disk, have aligned magnetic moments as compelled by the exchange interaction that causes ferromagnetism in the first place. Helimagnets are new types of magnets that exist in materials with broken inversion (non-centrasymmetric) symmetry, which enables the Dzyaloshinskii-Moriya interaction (DMI) to favor moments to be perpendicular to each other.  As a result of the competition, the ground state of a helimagnet is a spin helix and equally fascinating, the existence of skyrmion in...

Energetic Molding of Chiral Magnetic Bubbles

  • By Aude Marjolin
  • 21 July 2016

When it comes to computers, people never look for “bigger and better,” but rather “smaller and faster.” How do we continue to keep up with that demand, making technology smaller, faster, and more energy-efficient? According to Vincent Sokalski, the answer may be in the fundamental origins of magnets—the spin of electrons.

Sokalski and his group studied the interaction of electron spins in magnetic materials poised for use in next-generation cellphones and computers and discovered how to better measure and predict the changing magnetic state of those materials. This new understanding, recently published in Physical Review B under the title "Energetic Molding of Chiral Magnetic Bubbles", is exciting for the future of computing technology because it will allow scientists to explore and develop materials that are more energy-efficient and faster than traditional semiconductor-based materials.