Magnetoresistance in LaFe<tex>$_11.2$</tex>Co<tex>$_0.7$</tex>Si<tex>$_1.1$</tex>Compound

Magnetoresistance in Ferromagnet Breakjunctions

We fabricate ferromagnetic nanowires with constrictions such that the cross-section at the constriction can be controllably reduced from 100 nm to the atomic scale by means of electromigration. This allows measurements of the resistance of a domain wall trapped at the constriction as a function of the cross-section’s size. We observe magnetoresistance (MR) of around 0.3% for a (100 x 30) nm2 wi...

Giant Magnetoresistance

In today’s world of portable, high capacity music players and consumer hard drives with storage sizes of up to a terabyte, the ubiquitousness of information and the space to store it seems to be almost taken for granted in our society. However, the emergence of such vast and economical storage of data has only occurred within the past 10 years. The most prominent driving force of this technolog...

Colossal Magnetoresistance

Colossal magnetoresistance (CMR) effect was discovered among the manganese oxide class of materials, i.e. La1−xCaxMnO3. It shows large magnetoresistance by orders of magnitude, however several environmental requirements limit CMR toward general applications. Recently people have been focused on understanding a fundamental physics because of complex correlations between electron-lattice and elec...

Colossal magnetoresistance

We review recent experimental work falling under the broad classification of colossal magnetoresistance (CMR), which is magnetoresistance associated with a ferromagnetic-toparamagnetic phase transition. The prototypical CMR compound is derived from the parent compound, perovskite LaMnO3. When hole doped at a concentration of 20–40% holes/Mn ion, for instance by Ca or Sr substitution for La, the...

Colossal Magnetoresistance