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OnderzoekZernike (ZIAM)FYSNDResearchMetallic Spintronics

Metallic Spintronics

Non-local spin-transfer-torque & Paramagnetic maser device

Spin-electronics, abbreviated spintronics, is the name for a type of electronics which does not utilize the charge of the electron, but it's intrinsic angular momentum called the electron spin. One of the first and also its largest success of this field lies in the discovery of the Giant Magneto Resistance (GMR) effect which is currently being commercially used in modern day hard drives. In 2007, the Nobel price has been awarded to Albert Fert and Peter Grunberg for the discovery of this phenomena.

Fig. 1: MRAM with equivalent resistor scheme
Fig. 1: MRAM with equivalent resistor scheme

One of the new promises of this field is the magnetic random access memory (MRAM) which can bridge the gap between fast but volatile DRAM memory and conventional storage like the hard drive. The MRAM technique is an elegant and efficient way that relies on the transfer of electronic spins between the two magnetic layers. Electrical currents sent through an MRAM device create a torque on the magnetization of the individual layers, the so-called spin transfer torque. If this spin transfer torque is strong enough it can cause a rotation of the magnetization. The resulting memory element is called a spin transfer torque MRAM or, in short, STT-MRAM. It has the ability to greatly reduce the electrical current needed to switch these memory elements, leading to a reduced size of these elements and increased operating speeds. Although much of the physics behind spin transfer torque is still unknown, companies like Grandis are already trying to commercialize the technology.

Projects

In our metallic spintronics team we are investigating fundamental spintronic phenomena in metallic nanoscale devices. We make use of state of the art electron beam lithography (resolutions of <50 nm) to make electronic devices and study many different spintronic effects like spin-transfer-torque, spin-pumping and, recently also spin-caloritronic effects. You can read more about it in the dedicated sections.

Bachelor / Master projects

Please contact one of the people involved in case you are interested in a research project in our group.

People involved in these projects:

Joost Flipse - PhD
Fasil Dejene - PhD
Bart van Wees - Professor

Laatst gewijzigd:09 juli 2015 10:59