Last updated: 04/04/2008

 

Spin-photonics Magneto-Optics

Spin-currents Spin Tansport

Magnetoresistance Magnetoresistance

Half-metals Magnetic materials

Domain structures Magnetic domains

Miscellaneous Basic magnetism

 

Spintronics for Kids!

We have been using magnets all over the places, such as on your fridge, in a moter and a speaker, in a hard disc drive in your computer, and even in your mobile phone! As you know, the magnets attract some metals, Fe, Co and Ni (ferromagnetic metals) for example. The oigin of this force is due to a circular electrical current. When you flow a current in a circular cable as shown in the right figure, this coil behaves like a magnet.

In an atomic scale, similarly, an electron, of which flow is an electrical current, revolves around an atom as well as rotates, showing a spin (see the left figure). This is the origin of the magnetism, which is the most old phenomena based on quantum physics in our history. The orientations of the spins are defined to be either up or down, corresponding to the N- or S-pole in a magnet (right bottom figure).

In spintronics, we study on the flow of these spins to contol and engineer the spin polarisation, total population of both up and down spins.