Journal ArticleDOI
Effect of MgO spacer and annealing on interface and magnetic properties of ion beam sputtered NiFe/Mg/MgO/CoFe layer structures
TLDR
In this article, the effect of variation in the thickness of ion assisted ion beam sputtered MgO spacer layer deposited at oxygen ion assisted energy of 50 eV on the extent of magnetic coupling of NiFe and CoFe layers in Si/NiFe(10 nm)/Mg(1.5Abstract:
The effect of variation in the thickness of ion assisted ion beam sputtered MgO spacer layer deposited at oxygen ion assisted energy of 50 eV on the extent of magnetic coupling of NiFe and CoFe layers in Si/NiFe(10 nm)/Mg(1 nm)/MgO(2,4,6 nm)/CoFe(10 nm) sandwich structure is investigated. At MgO spacer layer thickness of 4 nm, the separate reversal of magnetizations of the two ferromagnetic layers is observed in the hystresis loop recorded along easy direction. This results in a 3.5 Oe wide plateau like region during magnetization reversal, which became 4.5 Oe at 6 nm thin MgO. At 2 nm thin MgO, the absence of plateau during magnetization reversal region revealed ferromagnetic coupling between the two ferromagnetic layers, which is understood to arise due to the growth of very thin and low density (1.22 gm/cc) MgO spacer layer, indicating the presence of pinholes as revealed by x-ray reflectometry. After vaccum annealing (200 °C/1 h), the plateau region for 4 and 6 nm thin MgO case decreased to 1.5 Oe and...read more
Citations
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Journal ArticleDOI
Observation of Uniaxial Magnetic Anisotropy and Out-of-Plane Coercivity in W/Co20Fe60B20/W Structures with High Thermal Stability
L. Saravanan,Nanhe Kumar Gupta,Lalit M. Pandey,I. Phebe Kokila,Helen Annal Therese,Sujeet Chaudhary +5 more
TL;DR: In this article, the development of uniaxial magnetic anisotropy and out-of-plane coercivity in W/Co20Fe60B20(CoFeB)/W structures by tuning the annealing temperature (TA) such as 300°C, 400°C and 500°C were achieved.
References
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Book
CRC Handbook of Chemistry and Physics
TL;DR: CRC handbook of chemistry and physics, CRC Handbook of Chemistry and Physics, CRC handbook as discussed by the authors, CRC Handbook for Chemistry and Physiology, CRC Handbook for Physics,
Journal ArticleDOI
Large magnetoresistance at room temperature in ferromagnetic thin film tunnel junctions.
TL;DR: b, R/R, is 11.8%, 20%, and 24%, respectively, consistent with Julliere's model based on the spin polarization of the conduction electrons of the magnetic films, in qualitative agreement with Slonczewski's model.
Journal ArticleDOI
Giant room-temperature magnetoresistance in single-crystal Fe/MgO/Fe magnetic tunnel junctions
TL;DR: A giant MR ratio up to 180% at room temperature in single-crystal Fe/MgO/Fe MTJs is reported, indicating that coherency of wave functions is conserved across the tunnel barrier.
Journal ArticleDOI
Giant tunnelling magnetoresistance at room temperature with MgO (100) tunnel barriers
Stuart S. P. Parkin,Christian Kaiser,Alex Panchula,Philip M. Rice,Brian M. Hughes,Mahesh G. Samant,See-Hun Yang +6 more
TL;DR: Sputter-deposited polycrystalline MTJs grown on an amorphous underlayer, but with highly oriented MgO tunnel barriers and CoFe electrodes, exhibit TMR values of up to ∼220% at room temperature and ∼300% at low temperatures, which will accelerate the development of new families of spintronic devices.
Journal ArticleDOI
Spin-dependent tunneling conductance of Fe | MgO | Fe sandwiches
TL;DR: In this paper, first-principles based calculations of the tunneling conductance and magnetoconductance of epitaxial ''mathrm{Fe}(100)|\mathm{MgO''(100), ''mgO''.
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