Basic Materials Advance Could Aid Electronics Industry

July 05, 1996

CORVALLIS - Researchers today announced a fundamental advance towards the future use of "colossal magnetoresistance," a concept that holds great potential for improvements in computer memory and the recording industry.

If perfected, this electronic phenomenon could dramatically improve the amount of data or information that can be stored on magnetic tapes, computer disks or other magnetic devices.

Only limited applications are now being made, scientists say, but the latest advance will point the way towards new research directions and types of materials that may be developed with this property.

The discovery was outlined today in the professional journal Science by a collaborative research team from Oregon State University, Dupont, Bell Laboratories, the Lawrence Livermore National Laboratory and the National Institute of Standards and Technology.

"This work describes a new route to creating this type of material that could be important," said Arthur Sleight, an OSU professor of chemistry.

With new approaches, the researchers hope that these materials could eventually be made to operate at room temperature - a key hurdle not now possible, but essential to their widespread commercial application.

Colossal magnetoresistance, Sleight said, is a known phenomena in which materials exposed to a magnetic field undergo a huge, and potentially permanent, increase in their electrical conductivity.

"Magnetic fields can have a minor effect on the electrical conductivity of many materials," said Sleight, who is the Milton Harris Professor of Materials Science at OSU. "With the ones that we describe as having colossal magnetoresistance, the effect is quite dramatic. It's almost like turning a material that used to be an electrical insulator into a conductor."

The value of this characteristic, researchers say, is that electronic devices created with these new materials can more effectively retrieve data from magnetic storage devices, such as audio tape or computer disks. That allows the data on these devices to be far more concentrated.

This characteristic has been recognized in some materials, such as lanthanum manganese oxide, for some time.

But in the Science article, the researchers announced the discovery of a new material - thallium manganese oxide - with the same characteristics. And they described the electronic and atomic behavior of manganese in a way not previously understood and one that challenges the conventional wisdom of how the materials function.

Neither the old, or the new material with colossal magnetoresistance successfully jumps the hurdle of room temperature operation, the scientists said. But the improved understanding of these materials should open some new avenues of research, Sleight said.

There is a high level of interest in these new materials in the computer and electronics industry, Sleight said.
-end-


Oregon State University

Related Manganese Articles from Brightsurf:

Stellar explosion in Earth's proximity
When the brightness of the star Betelgeuse dropped dramatically a few months ago, some observers suspected an impending supernova - a stellar explosion that could also cause damage on Earth.

Lightweight green supercapacitors could charge devices in a jiffy
In a new study, researchers at Texas A&M University have described their novel plant-based energy storage device that could charge even electric cars within a few minutes in the near future.

Manganese single-atom catalyst boosts performance of electrochemical CO2 Reduction
A research team led by Prof. ZHANG Suojiang from the Institute of Process Engineering (IPE) of the Chinese Academy of Sciences prepared a manganese (Mn) single-atom catalyst (SAC) with Mn-N3 site supported by graphitic C3N4, which exhibited efficient performance of CO2 electroreduction.

Way, shape and form: Synthesis conditions define the nanostructure of manganese dioxide
Scientists at Tokyo Institute of Technology explore a novel and simplistic method to synthesize manganese dioxide with a specific crystalline structure called β-MnO2.

Bacteria with a metal diet discovered in dirty glassware
Newfound bacteria that oxidize manganese help explain the geochemistry of groundwater.

Higher manganese levels in early pregnancy linked to lower preeclampsia risk
An analysis of data from more than 1,300 women followed prospectively through pregnancy found that women with lower levels of the essential mineral manganese in early pregnancy were more likely to develop the serious high blood pressure syndrome called preeclampsia in late pregnancy.

Supercapacitor promises storage, high power and fast charging
A new supercapacitor based on manganese oxide could combine the storage capacity of batteries with the high power and fast charging of other supercapacitors, according to researchers at Penn State and two universities in China.

Topological materials for information technology offer lossless transmission of signals
New experiments with magnetically doped topological insulators at BESSY II have revealed possible ways of lossless signal transmission that involve a surprising self-organisation phenomenon.

Scientists link decline of baltic cod to hypoxia -- and climate change
If you want to know how climate change and hypoxia -- the related loss of oxygen in the world's oceans -- affect fish species such as the economically important Baltic cod, all you have to do is ask the fish.

Secure printing with water-based invisible ink
Researchers in China have developed a rewriteable paper coating that can encrypt secret information with relatively low-tech invisible ink -- water.

Read More: Manganese News and Manganese Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.