Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Magnetization reversal achieved at room temperature using only an electric field

22.02.2019

Scientists at Tokyo Institute of Technology achieved magnetization reversal in cobalt-substituted bismuth ferrite by applying only an electric field. Such an effect had been sought after for over a decade in order to make new types of low-power-consumption magnetic memory devices.

In the era of information technology revolution, electronics demand rapid evolution facilitated by greater efforts from materials researchers to pave the way for further improvements and novel devices.


Magnetization reversal at room temperature using an electric field.

Credit: Keisuke Shimizu, Masaki Azuma, Tokyo Institute of Technology

In particular, a better understanding of the electromagnetic properties of various types of materials and new ways to harness them would allow for the fabrication of devices based on such principles.

Two years ago, a research team from the Laboratory for Materials and Structures at Tokyo Institute of Technology (Tokyo Tech), led by Prof. Masaki Azuma, demonstrated very promising properties of Cobalt-substituted Bismuth ferrite (BFCO).

This peculiar material exhibits both ferroelectric and ferromagnetic properties at room temperature; these two are coupled in a way that, the team inferred, could be exploited to exhibit reversal of the magnetization of the material by application of only an electric field at room temperature without the need of electric current.

In a more recent study, the team presented proof of this hypothesized magnetization reversal in thin films of BFCO at room temperature. While previous researchers saw some success in achieving magnetization reversal, their results were for in-plane magnetization on a multi-layer material, which carries some disadvantages.

"Direct observation of magnetization reversal on a single-phase material with ferroelectric and ferromagnetic orderings is crucial to the study of the intrinsic coupling between them. Moreover, out-of-plane magnetization reversal is desirable from the viewpoint of integration," explains Azuma.

Thus, the team fabricated thin BFCO films that exhibited spontaneous magnetization. Because BFCO is very sensitive to lattice strain, these thin films were grown on orthorhombic GdScO3, whose lattice structure matches that of BFCO maximally and bolster the growth of highly crystalline films with minimal lattice strain.

After verifying the presence of the sought-after out-of-plane magnetization, the team went on to investigate the correlation between the ferromagnetic and ferroelectric domains to see if magnetization reversal was possible by switching electric polarization.

In the resulting piezoelectric force microscopy and magnetic force microscopy images, the researchers found that their attempts were successful and that it was indeed possible to achieve out-of-plane magnetization reversal using an electric field at room temperature.

This represents the first time that such a feat was carried out, and could soon become the operating principle of a new type of memory device, as explains Azuma: "The current demonstration of magnetic reversal using an electric field paves the way to low power-consumption, non-volatile magnetic memories, such as magnetoresistive random-access memories."

These findings also bring hope to all researchers in this particular field who, although had collectively been working on magnetization reversal for 15 years, had not yet reported such promising results.

Media Contact

Emiko Kawaguchi
media@jim.titech.ac.jp
81-357-342-975

http://www.titech.ac.jp/english/index.html 

Emiko Kawaguchi | EurekAlert!
Further information:
http://dx.doi.org/10.1021/acs.nanolett.8b04765

More articles from Power and Electrical Engineering:

nachricht New Record: PLQE of 70.3% in lead-free halide double perovskites
22.07.2019 | Science China Press

nachricht First-ever visualizations of electrical gating effects on electronic structure
18.07.2019 | University of Warwick

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: MOF@SAW: Nanoquakes and molecular sponges for weighing and separating tiny masses

Augsburg chemists and physicists report how they have succeeded in the extremely difficult separation of hydrogen and deuterium in a gas mixture.

Thanks to the Surface Acoustic Wave (SAW) technology developed here and already widely used, the University of Augsburg is internationally recognized as the...

Im Focus: Better thermal conductivity by adjusting the arrangement of atoms

Adjusting the thermal conductivity of materials is one of the challenges nanoscience is currently facing. Together with colleagues from the Netherlands and Spain, researchers from the University of Basel have shown that the atomic vibrations that determine heat generation in nanowires can be controlled through the arrangement of atoms alone. The scientists will publish the results shortly in the journal Nano Letters.

In the electronics and computer industry, components are becoming ever smaller and more powerful. However, there are problems with the heat generation. It is...

Im Focus: First-ever visualizations of electrical gating effects on electronic structure

Scientists have visualised the electronic structure in a microelectronic device for the first time, opening up opportunities for finely-tuned high performance electronic devices.

Physicists from the University of Warwick and the University of Washington have developed a technique to measure the energy and momentum of electrons in...

Im Focus: Megakaryocytes act as „bouncers“ restraining cell migration in the bone marrow

Scientists at the University Würzburg and University Hospital of Würzburg found that megakaryocytes act as “bouncers” and thus modulate bone marrow niche properties and cell migration dynamics. The study was published in July in the Journal “Haematologica”.

Hematopoiesis is the process of forming blood cells, which occurs predominantly in the bone marrow. The bone marrow produces all types of blood cells: red...

Im Focus: Artificial neural network resolves puzzles from condensed matter physics: Which is the perfect quantum theory?

For some phenomena in quantum many-body physics several competing theories exist. But which of them describes a quantum phenomenon best? A team of researchers from the Technical University of Munich (TUM) and Harvard University in the United States has now successfully deployed artificial neural networks for image analysis of quantum systems.

Is that a dog or a cat? Such a classification is a prime example of machine learning: artificial neural networks can be trained to analyze images by looking...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

2nd International Conference on UV LED Technologies & Applications – ICULTA 2020 | Call for Abstracts

24.06.2019 | Event News

SEMANTiCS 2019 brings together industry leaders and data scientists in Karlsruhe

29.04.2019 | Event News

Revered mathematicians and computer scientists converge with 200 young researchers in Heidelberg!

17.04.2019 | Event News

 
Latest News

Toward molecular computers: First measurement of single-molecule heat transfer

22.07.2019 | Information Technology

First impressions go a long way in the immune system

22.07.2019 | Health and Medicine

New Record: PLQE of 70.3% in lead-free halide double perovskites

22.07.2019 | Power and Electrical Engineering

VideoLinks
Science & Research
Overview of more VideoLinks >>>