Spintronics

New perovskite LED emits a circularly polarized glow

A team of researchers from the National Renewable Energy Laboratory (NREL) and the University of Utah has developed a new type of LEDs that utilizes spintronics without needing a magnetic field, magnetic materials or cryogenic temperatures.

New spin-LED emits a circularly polarized glow image

'The companies that make LEDs or TV and computer displays don't want to deal with magnetic fields and magnetic materials. It's heavy and expensive to do it,' said Valy Vardeny, distinguished professor of physics and astronomy at the University of Utah. 'Here, chiral molecules are self-assembled into standing arrays, like soldiers, that actively spin polarize the injected electrons, which subsequently lead to circularly polarized light emission. With no magnetic field, expensive ferromagnets and with no need for extremely low temperatures. Those are no-nos for the industry.'

Read the full story Posted: Mar 14,2021

Magnetic lead-free double perovskite could be useful for spintronics devices

An international researchers team recently found that a new 'double perovskite' material could become a more environmentally friendly platform for spintronics devices thanks to its lead-free nature. While the material in its current form is only magnetic below 30 K ' too low for practical applications ' developers at Linköping University in Sweden, together with colleagues in the US, the Czech Republic, Japan, Australia and China, say that their preliminary experiments are a promising step towards making rapid and energy-efficient information storage devices from this novel optoelectronic material.

Recently, researchers discovered that lead halide perovskites display interesting spin properties thanks to lead's strong spin-orbit coupling. This coupling links the motion of an electron to its quantum spin, and its strength determines how much the intrinsic spin of an electron will interact with the magnetic field induced as the electron moves through the material. Such a coupling is therefore important not only for the magnetic properties of a material, but also for the performance of any spintronics devices.

Read the full story Posted: Dec 01,2020

Researchers achieve magnetic lead-free halide double perovskites

Researchers at Linköping University in Sweden have announced the development of an optoelectronic magnetic double perovskite. The discovery could open the door to combining spintronics with optoelectronics for rapid and energy-efficient information storage.

The team explains that one type of perovskite that contains halogens and lead has recently been shown to have interesting magnetic properties, opening the possibility of using it in spintronics. Spintronics is thought to have huge potential for the next generation of information technology, since information can be transmitted at higher speeds and with low energy consumption. However, magnetic properties of halide perovskites have until now been associated only with lead-containing perovskites, which has limited the development of the material for both health and environmental reasons.

Read the full story Posted: Nov 08,2020

Interfacing oxide perovskites with antiperovskites could boost materials design and engineering

In a recent report, Camilo X. Quintela and an international group in materials science, physics and engineering in the U.S., Norway, China and South Korea proposed a novel direction for materials design based on nitride antiperovskite and oxide perovskite crystals.

Schematic representation of the crystal structures of M3XN nitride antiperovskite and ABO3 oxide perovskite compounds and their interfaces imageSchematic representation of the crystal structures of M3XN nitride antiperovskite and ABO3 oxide perovskite compounds and their interfaces. Image from Science Advances

In this work, they successfully layered perovskites and antiperovskites together, to create an interface with unique electrical properties for applications in a new class of quantum materials.

Read the full story Posted: Jul 30,2020

Perovskites combine with special organic molecules to advance spintronics and quantum computing

Scientists at the National Renewable Energy Laboratory and the University of Utah have shown that the transport of electrons with a particular spin state through a two-dimensional hybrid organic-inorganic perovskite can be manipulated by introducing special organic molecules in the multilayer structure. These are chiral, which means they prefer one electron helicity over the other. The new study may advance the field of spintronics'electronics that use the minuscule magnetic fields emanating from spinning electrons as well as the electric charges of the electrons themselves'for faster, smaller electronic devices that use less energy.

The Utah researchers worked together under the umbrella of the Center for Hybrid Organic Inorganic Semiconductors for Energy (CHOISE), an Energy Frontier Research Center funded by the U.S. Department of Energy's Office of Science, Basic Energy Sciences.

Read the full story Posted: Dec 08,2019

Perovskites found promising as spintronics materials, researchers develop two new perovskite spintronics devices

Researchers from the University of Utah have developed two spintronics devices based on perovskite materials. The researchers used these new devices to demonstrate the high potential of perovksites for spintronics systems. This is a followup to the exciting results announced in 2017 by the same group that showed advantages of perovskites for spintronics.

Perovskite spintronics LED wavelength (Utah University)

The researchers used an organic-inorganic hybrid perovskite material with a heavy lead atom that features strong spin-orbit coupling and a long injected spin lifetime. The first device was a spintronic LED, which worked with a magnetic electrode instead of an electron-hole electrode. The perovskite LED lights up with circularly polarized electroluminescence.

Read the full story Posted: Jan 14,2019

Cornell team uses laser pulses to change the properties of a perovskite material

Researchers at Cornell used theoretical techniques to predict that using intense mid-infrared laser light on a titanium perovskite can dynamically induce a magnetic phase transition ' taking the material from its ferromagnetic ground state to a hidden anti-ferromagnetic phase. This dramatic shift could have useful applications, particularly in optical information processing.

'It would be a kind of optical switch,' the researchers said. 'You have a material where it's magnetic and 'non-magnetic.' It's going between those two states with light'.

Read the full story Posted: Mar 13,2018

Perovskite materials found to feature easily controlled electron spin and long spin lifetime

Researchers from the University of Utah discovered that organic-inorganic hybrid perovskites feature two contradictory properties - easily controlled electron spin and long spin lifetime (up to a nanosecond). This is a unique combination of two highly sought after properties for spintronics devices.

Hybrid organic-inorganic perovskite spintronics research (University of Utah)

The specific material used in this research is the hybrid perovskite methyl-ammonium lead iodine (CH3NH3PbI3). In their study, a thin film of this material was placed in front of an ultrafast laser that was used to set the electron's spin orientation and also observe the spin precession.

Read the full story Posted: May 30,2017