Nav: Home

Lobachevsky University researchers obtain magnetic semiconductor layers of a new type

January 22, 2018

Researchers at the laboratory of spin and optical electronics of the Lobachevsky University (Nizhny Novgorod, Russia) have obtained a new type of magnetic semiconductor layers, which demonstrate spin-dependent phenomena in the transport of charge carriers at room temperature.

It is well known that in magnetic semiconductors the current is conducted by means of spin-polarized charge carriers, which offers additional possibilities for creating information- processing devices based on the use of both the electron charge and its spin. For practical implementation of spintronic semiconductor devices, magnetic semiconductors operating at room Curie temperature are required.

Using pulsed laser deposition, Nizhny Novgorod scientists have fabricated (In,Fe)Sb epitaxial layers with Fe content up to 13 atomic % on GaAs substrates. These layers exhibit ferromagnetic properties up to room temperature. In the (In,Fe)Sb layers, characteristic spin-dependent electron transport phenomena were observed at room temperature, including the anomalous Hall effect and the hysteresis negative magnetoresistance. This indicates that conduction electrons in the synthesized semiconductor have spin polarization at room temperature, i.e. most electrons have a common spin direction, similar to what happens in a ferromagnetic metal. The new magnetic semiconductor's unique feature is that its ferromagnetism is intrinsic, associated with the formation of a spin-split band structure. This, in particular, is manifested in spin-dependent optical transitions in the band structure of the semiconductor and phase homogeneity of the material. In turn, intrinsic ferromagnetism is a necessary condition for using semiconductor ferromagnetic materials, since it provides spin-dependent optical and transport properties of the semiconductor.

Low Curie temperature of magnetic semiconductors is a serious limitation on the way of their practical use. For the first time, the Curie temperature exceeding the room temperature was achieved for the material (In,Fe)Sb obtained by Lobachevsky University scientists. Their results have been reported in the Journal of Applied Physics:

High-temperature intrinsic ferromagnetism in the (In,Fe)Sb semiconductor / A.V. Kudrin, Yu.A. Danilov, V.P. Lesnikov, M.V. Dorokhin, O.V. Vikhrova, D.A. Pavlov, Yu.V. Usov, I.N.
Antonov, R.N. Kriukov, A.V. Alaferdov, and N.A. Sobolev // Journal of Applied Physics 122, 183901 (2017)

Lobachevsky University

Related Semiconductor Articles:

Clemson researcher's novel MOF is potential next-gen semiconductor
Clemson professor Sourav Saha demonstrated a novel double-helical metal organic framework architecture in a partially oxidized form that conducts electricity, potentially making it a next-generation semiconductor.
A gold butterfly can make its own semiconductor skin
A nanoscale gold butterfly provides a more precise route for growing/synthesizing nanosized semiconductors that can be used in nano-lasers and other applications.
Scientists pioneer new generation of semiconductor neutron detector
In a new study, scientists have developed a new type of semiconductor neutron detector that boosts detection rates by reducing the number of steps involved in neutron capture and transduction.
Scientists see defects in potential new semiconductor
A research team has reported seeing, for the first time, atomic scale defects that dictate the properties of a new and powerful semiconductor.
Bending an organic semiconductor can boost electrical flow
Slightly bending semiconductors made of organic materials can roughly double the speed of electricity flowing through them and could benefit next-generation electronics such as sensors and solar cells, according to Rutgers-led research.
Paving a way to achieve unexplored semiconductor nanostructures
A research team of Ehime University paved a way to achieve unexplored III-V semiconductor nanostructures.
Clarification of a new synthesis mechanism of semiconductor atomic sheet
Researchers at Tohoku University in Japan succeeded in clarifying a new synthesis mechanism regarding transition metal dichalcogenides (TMD), which are semiconductor atomic sheets having thickness in atomic order.
Future of portable electronics -- Novel organic semiconductor with exciting properties
Organic semiconductors have advantages over inorganic semiconductors in several areas.
A new method for quantifying crystal semiconductor efficiency
Japanese scientists have found a new way to successfully detect the efficiency of crystal semiconductors.
X-rays reveal monolayer phase in organic semiconductor
An international team of researchers has investigated how the electrical properties of dihexyl-quarterthiophene thin films depend on their structure.
More Semiconductor News and Semiconductor Current Events

Trending Science News

Current Coronavirus (COVID-19) News

Top Science Podcasts

We have hand picked the top science podcasts of 2020.
Now Playing: TED Radio Hour

Listen Again: Reinvention
Change is hard, but it's also an opportunity to discover and reimagine what you thought you knew. From our economy, to music, to even ourselves–this hour TED speakers explore the power of reinvention. Guests include OK Go lead singer Damian Kulash Jr., former college gymnastics coach Valorie Kondos Field, Stockton Mayor Michael Tubbs, and entrepreneur Nick Hanauer.
Now Playing: Science for the People

#562 Superbug to Bedside
By now we're all good and scared about antibiotic resistance, one of the many things coming to get us all. But there's good news, sort of. News antibiotics are coming out! How do they get tested? What does that kind of a trial look like and how does it happen? Host Bethany Brookeshire talks with Matt McCarthy, author of "Superbugs: The Race to Stop an Epidemic", about the ins and outs of testing a new antibiotic in the hospital.
Now Playing: Radiolab

Dispatch 6: Strange Times
Covid has disrupted the most basic routines of our days and nights. But in the middle of a conversation about how to fight the virus, we find a place impervious to the stalled plans and frenetic demands of the outside world. It's a very different kind of front line, where urgent work means moving slow, and time is marked out in tiny pre-planned steps. Then, on a walk through the woods, we consider how the tempo of our lives affects our minds and discover how the beats of biology shape our bodies. This episode was produced with help from Molly Webster and Tracie Hunte. Support Radiolab today at