GIANT MAGNETO RESISTANCE. GMR READING HEAD

Abstract

The 9th past october won the No

bel Prize for Physics 2007 Albert Fert

and Peter Grünberg for their disco

very of Gigant Magnetic Resistance, a

key component of the computer´s re

ading head, running at a high speed,

detecting very weak magnetic fields.

The electric resistance is caused

by the phonons, a quantic vibration.

The magnetic resistance is mea

sured as a change of conductor´s re

sistance, when a magnetic field is pa

rallel, or not parallel to the electric

current. 

The readng head is a multisheet

of alternated metals:ferromagnetic

and paramagnetic.

The non magnetic isolant sheet, a

few nanometers wide, is in the middle

of ferromagnetic sheets.

The GMR Spintronics measure

the electric charge of the electron,

and its spin.