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Quantum Hall effect in a bulk antiferromagnet EuMnBi2 with magnetically confined two-dimensional Dirac fermions.

For the innovation of spintronic technologies, Dirac materials, in which low-energy excitation is described as relativistic Dirac fermions, are one of the most promising systems because of the fascinating magnetotransport associated with extremely high mobility. To incorporate Dirac fermions into spintronic applications, their quantum transport phenomena are desired to be manipulated to a large extent by magnetic order in a solid.

We report a bulk half-integer quantum Hall effect in a layered antiferromagnet EuMnBi2, in which field-controllable Eu magnetic order significantly suppresses the interlayer coupling between the Bi layers with Dirac fermions. In addition to the high mobility of more than 10,000 cm2/V s, Landau level splittings presumably due to the lifting of spin and valley degeneracy are noticeable even in a bulk magnet. These results will pave a route to the engineering of magnetically functionalized Dirac materials.

This research was conducted through collaborative research with Tokyo University, Osaka University, RIKEN, High Energy Accelerator Research Organization and IMR. This article carried in Science Advances.


detail1: press release (in Japanese) [PDF:940KB]

detail2: Science Advances Website [DOI: 10.1126/sciadv.1501117]


Enhanced output of a giant magnetoresistance device for hard disc drive application.

Mitsubishi Gas Chemical Co., Inc. (MGC), Tohoku University's Advanced Institute for Material Research (AIMR) and Institute for Materials Research (IMR) have developed mass production technology for LiBH4-based solid electrolytes.


These electrolytes are created based on technology developed by Tohoku University, and are suitable as they are flexible and can adhere well to the electrode layer.


There are 2 types of these electrolytes: LiBH4-LiI solid solution and LiBH4-LiNH2 based solid electrolyte. MGC will start supplying the sample of these electrolytes.


For more information on these LiBH4-based solid electrolytes, join MGC at the following conferences.


-nano tech 2016 - The 15th International Nanotechnology

Exhibition & Conference

Dates: January 27 - 29, 2016

Venue: Tokyo Big Sight, Japan

Booth: 6C-06



-7th Int'l Rechargeable Battery Expo (BATTERY JAPAN)

Dates: March 2 - 4, 2016

Venue: Tokyo Big Sight, Japan

Booth: W29-32