Enhancement of giant magnetoresistance by L21 ordering in Co2Fe(Ge0.5Ga0.5) Heusler alloy current-perpendicular-to-plane pseudo spin valves
- 22 July 2013
- journal article
- conference paper
- Published by AIP Publishing in Applied Physics Letters
- Vol. 103 (4) , 042405
Abstract
We report large magnetoresistance (MR) output in fully epitaxial Co2Fe(Ge0.5Ga0.5)/Ag/Co2Fe(Ge0.5Ga0.5) current-perpendicular-to-plane pseudo spin valves. The resistance-area product change (ΔRA) of 12 mΩμm2 at room temperature (RT), equivalent to MR ratio of 57%, and ΔRA = 33 mΩμm2 at 10 K, equivalent to MR ratio of 183%, were obtained by using L21-ordered Co2Fe(Ge0.5Ga0.5) ferromagnetic electrodes. The bulk spin scattering asymmetry (β) were estimated to be ∼0.83 at RT and ∼0.93 at 10 K for the L21-ordered Co2Fe(Ge0.5Ga0.5) films by the Valet-Fert model, indicating that the L21-ordered Co2FeGe0.5Ga0.5 Heusler alloy is virtually half-metal at 10 K, but its half-metallicity is degraded at RT.Keywords
This publication has 28 references indexed in Scilit:
- Tunnel Magnetoresistance above 170% and Resistance–Area Product of 1 Ω (µm)2Attained byIn situAnnealing of Ultra-Thin MgO Tunnel BarrierApplied Physics Express, 2011
- Magnetoresistance Ratio and Resistance Area Design of CPP-MR Film for 2–5 $\hbox{Tb/in}^{2}$ Read SensorsIEEE Transactions on Magnetics, 2010
- 2 ${\hbox{Tbit/in}}^{2}$ Reader Design OutlookIEEE Transactions on Magnetics, 2010
- CPP-GMR technology for magnetic read heads of future high-density recording systemsJournal of Magnetism and Magnetic Materials, 2009
- Giant tunnel magnetoresistance in magnetic tunnel junctions with a crystalline MgO(0 0 1) barrierJournal of Physics D: Applied Physics, 2007
- Magnetic tunnel junctionsMaterials Today, 2006
- Giant room-temperature magnetoresistance in single-crystal Fe/MgO/Fe magnetic tunnel junctionsNature Materials, 2004
- Giant tunnelling magnetoresistance at room temperature with MgO (100) tunnel barriersNature Materials, 2004
- Output enhancement of spin-valve giant magnetoresistance in current-perpendicular-to-plane geometryJournal of Applied Physics, 2002
- Giant magnetroresistance properties of specular spin valve films in a current perpendicular to plane structureJournal of Applied Physics, 2001