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Half-Metallic Single Crystal CrO2 Films(JHU MRSEC) Spintronic effects & devices depend directly on spin polarization P Density of states FM metal 0 < P < 1 NM metal P = 0 Half Metal P = 1 (e.g., Cu) (e.g., Co) the ultimate
Spintronic effects & deviceshigh R low R GMR Spin-valve GMR read-head MRAM high R low R TMR
Half Metallic FerromagnetsThe ultimate spin-polarized material Band structure of CrO2 A single spin band 100% spin polarized Integer magnetic moment/unit cell M = µB (nmajority - nminority) nmajority + nminority = integer nmajority = integer nmajority - nminority = integer CrO2 (2 µB/unit cell) Crystal lattice of CrO2
Single Crystal  CrO2 Films by CVDPoint Contact Andreev Reflection In ballistic (Sharvin) limit l > a Mean free path contact size CrO2 (P = 98.4%) is half metallic ! Ji, Strijkers, Yang, Chien, Byers, Anguelouch, Xiao, and Gupta, Phys. Rev. Lett. 86, 5585 (2001). Anguelouch, Gupta, Xiao, Abraham, Ji, Ingvarsson, and Chien, Phys. Rev. B 64, (R) (2001).
Significance of Half-Metallic FerromagnetsUltimate magnetic tunnel junctions: infinite TMR Conducting Insulating Perfect spin injector for semiconductors and metals Physics of a single spin band
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