High-Speed Motion Core Technology for Magnetic Memory


Reading time ( words)

A joint research team led by Professor Kab-Jin Kim of the Department of Physics, KAIST and Professor Kyung-Jin Lee at Korea University developed technology to dramatically enhance the speed of next generation domain wall-based magnetic memory.

Currently-used memory materials, D-RAM and S-RAM, are fast but volatile, leading to memory loss when the power is switched off. Flash memory is non-volatile but slow, while hard disk drives (HDD) have greater storage but are high in energy usage and weak in physical shock tolerance. 

To overcome the limitations of existing memory materials, ‘domain wall-based, magnetic memory’ is being researched. The core mechanism of domain wall magnetic memory is the movement of a domain wall by the current. Non-volatility is secured by using magnetic nanowires and the lack of mechanical rotation reduced power usage. This is a new form of high density, low power next-generation memory. 

However, previous studies showed the speed limit of domain wall memory to be hundreds m/s at maximum due to the ‘Walker breakdown phenomenon’, which refers to velocity breakdown from the angular precession of a domain wall. Therefore, there was a need to develop core technology to remove the Walker breakdown phenomenon and increase the speed for the commercialization of domain wall memory. 

Most domain wall memory studies used ferromagnetic bodies, which cannot overcome the Walker breakdown phenomenon. The team discovered that the use of ‘ferrimagnetic‘ GdFeCo at certain conditions could overcome the Walker breakdown phenomenon and using this mechanism they could increase domain wall speed to over 2Km/s at room temperature. 

Domain wall memory is high-density, low-power, and non-volatile memory. The memory could be the leading next-generation memory with the addition of the high speed property discovered in this research. 

Professor Kim said, “This research is significant in discovering a new physical phenomenon at the point at which the angular momentum of a ferrimagnetic body is 0 and it is expected to advance the implementation of next-generation memory in the future.”

Share


Suggested Items

RapidScat Team Investigating Power System Anomaly

09/12/2016 | NASA
Mission managers at NASA's Jet Propulsion Laboratory, Pasadena, California, and NASA’s Marshall Space Flight Center, Huntsville, Alabama, are assessing two power system-related anomalies affecting the operation of NASA’s ISS-RapidScat instrument aboard the International Space Station.

Graphene Device Could Substantially Increase the Energy Efficiency of Fossil Fuel-powered Cars

06/02/2016 | University of Manchester
A graphene-based electrical nano-device has been created which could substantially increase the energy efficiency of fossil fuel-powered cars.

Tax Incentives Brighten Future for Solar Equipment Industry in 2016

01/06/2016 | Dick Crowe, Burkle NA
Recent budget legislation passed by Congress surprised many with the renewal of the tax incentives for Solar Power. What was to be a tumultuous, very busy year for Solar Manufacturers in 2016 and then a sharp drop in 2017 will stabilize production and lead to more efficient operations.



Copyright © 2018 I-Connect007. All rights reserved.