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
Failure Analysis in Magnetic Tunnel Junction Nanopillar with Interfacial Perpendicular Magnetic Anisotropy.
Weisheng Zhao,Xiaoxuan Zhao,Boyu Zhang,Kaihua Cao,Lezhi Wang,Wang Kang,Qian Shi,Mengxing Wang,Yu Zhang,You Wang,Shouzhong Peng,Jacques-Olivier Klein,Lirida Alves de Barros Naviner,Dafiné Ravelosona +13 more
TL;DR: This paper gives a full analysis of failure mechanisms for PMA-MTJ and presents some eventual solutions from device fabrication to system level integration to optimize the failure issues.
Journal ArticleDOI
Growth dependent magnetization reversal in Co2MnAl full Heusler alloy thin films
TL;DR: In this article, an M-shaped curve is observed in the in-plane angular (0°−360°) dependent coercivity (ADC) by magneto-optical Kerr effect measurements.
Posted Content
Survey on STT-MRAM Testing: Failure Mechanisms, Fault Models, and Tests
TL;DR: This paper presents all STT-MRAM failure mechanisms: manufacturing defects, extreme process variations, magnetic coupling,STT-switching stochasticity, and thermal fluctuation, and the resultant fault models including permanent faults and transient faults.
Journal ArticleDOI
Electronic structure of magnetic Fe/MgO/Fe/Co multilayer structure by NEXAFS spectroscopy
Jitendra Pal Singh,Sanjeev Gautam,Weon Cheol Lim,K. Asokan,Braj Bhusan Singh,M. Raju,Sujeet Chaudhary,D. Kabiraj,D. Kanjilal,Jenn-Min Lee,Jing-Ming Chen,Keun Hwa Chae +11 more
TL;DR: In this paper, angle dependent near-edge X-ray absorption fine structure (NEXAFS) spectroscopy was used to investigate the local electronic structure of magnetic Fe/MgO/Fe/Co multilayer structure.
Journal ArticleDOI
Study of angular dependence of exchange bias and misalignment in uniaxial and unidirectional anisotropy in NiFe(111)/FeMn(111)/CoFeB(amorphous) stack
TL;DR: In this paper, the in-plane azimuthal angular dependence of the magnetization reversal in the ion beam sputtered exchanged biased NiFe(111)/FeMn(1)/CoFeB(amorphous) stack was investigated.
References
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Journal ArticleDOI
X-ray photoelectron spectroscopy and conducting atomic force microscopy investigations on dual ion beam sputtered MgO ultrathin films
TL;DR: In this paper, trilathin films of MgO were characterized by X-ray photoelectron spectroscopy (XPS) for chemical state analysis and conducting atomic force microscopy for topography and local conductivity map.
Journal ArticleDOI
Low resistance spin dependent tunneling junctions with naturally oxidized tunneling barrier
TL;DR: In this article, the effect of aluminum thickness on resistance area product and MR ratio in spin-dependent tunnel junctions was investigated and the optimum thickness of aluminum is 6-7 /spl Aring/ fur natural oxidation.
Journal ArticleDOI
Modulation of interlayer exchange coupling by ion irradiation in magnetic tunnel junctions
Etienne Snoeck,P. Baules,Gérard Benassayag,Coriolan Tiusan,F. Greullet,Michel Hehn,Alain Schuhl +6 more
TL;DR: In this article, an ion implantation of epitaxial Fe/MgO/Fe magnetic tunnel junctions exhibiting antiferromagnetic exchange coupling by spin polarized tunneling has been performed.
Journal ArticleDOI
Tunneling behavior in ion-assist ion-beam sputtered CoFe/MgO/NiFe magnetic tunnel junctions
TL;DR: In this article, magnetic tunnel junctions consisting of CoFe and NiFe as ferromagnetic electrodes and MgO as insulating barrier fabricated through in situ shadow masking employing ion beam sputtering are studied for their tunneling magnetoresistance (TMR) and temperature dependence of the tunneling conductance behavior.
Journal ArticleDOI
Permalloy multilayers to reduce the effects of uniaxial anisotropy
J.W. Wieberdink,K.J.M. Eijkel +1 more
TL;DR: In this paper, the Stoner-Wohlfarth single-domain model is used to describe the systematic error of an angle detector using multilayers with different orientations of their anisotropy axes.
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