Back CMR-Effekt German Magnetorresistencia colosal Spanish مقاومت مغناطیسی بسیار بزرگ Persian Magnétorésistance colossale French Magnetoresistenza colossale Italian Kolosalny magnetoopór Polish Magnetorresistência colossal Portuguese Колоссальное магнетосопротивление Russian Từ điện trở siêu khổng lồ Vietnamese 超巨磁阻效应 Chinese
Colossal magnetoresistance (CMR) is a property of some materials, mostly manganese-based perovskite oxides, that enables them to dramatically change their electrical resistance in the presence of a magnetic field. The magnetoresistance of conventional materials enables changes in resistance of up to 5%, but materials featuring CMR may demonstrate resistance changes by orders of magnitude.[1][2]
This technology may find uses in disk read-and-write heads, allowing for increases in hard disk drive data density. However, so far it has not led to practical applications because it requires low temperatures and bulky equipment.[3][4]
- ^ Ramirez, A. P. (1997). "Colossal magnetoresistance". Journal of Physics: Condensed Matter. 9 (39): 8171–8199. Bibcode:1997JPCM....9.8171R. doi:10.1088/0953-8984/9/39/005. S2CID 19951846.
- ^ Rodriguez-Martinez, L.; Attfield, J.P. (1996). "Cation disorder and size effects in magnetoresistive manganese oxide perovskites". Physical Review B. 54 (22): R15622–R15625. Bibcode:1996PhRvB..5415622R. doi:10.1103/PhysRevB.54.R15622. PMID 9985717.
- ^ "Chemists exploring new material with 'next generation' computer hard drive possibilities". The University of Aberdeen News. 27 January 2014.
- ^ Dagotto, Elbio (14 March 2013). "Brief Introduction to Giant Magnetoresistance (GMR)". Nanoscale Phase Separation and Colossal Magnetoresistance: The Physics of Manganites and Related Compounds. Springer Series in Solid-State Sciences. Vol. 136. Springer Science & Business Media. pp. 395–396. doi:10.1007/978-3-662-05244-0_21. ISBN 9783662052440.