skip to main content

Title: Field-current phase diagrams of in-plane spin transfer torque memory cells with low effective magnetization storage layers

Field-current phase diagrams were measured on in-plane anisotropy Co{sub 60}Fe{sub 20}B{sub 20} magnetic tunnel junctions to obtain the spin transfer torque (STT) field-current switching window. These measurements were used to characterise junctions with varying free layer thicknesses from 2.5 down to 1.1 nm having a reduced effective demagnetizing field due to the perpendicular magnetic anisotropy at CoFeB/MgO interface. Diagrams were obtained with 100 ns current pulses, of either same or alternating polarity. When consecutive pulses have the same polarity, it is possible to realize the STT switching even for conditions having a low switching probability. This was evidenced in diagrams with consecutive pulses of alternating polarity, with 100% switching obtained at 4.7 MA/cm{sup 2}, compared to the lower 3.4 MA/cm{sup 2} value for same polarity pulses. Although the low level of the current density window is higher in alternating polarity diagrams, the field window in both diagrams is the same and therefore independent of the pulse polarity sequence.
Authors:
; ; ; ;  [1] ;  [2] ;  [3]
  1. SPINTEC, UMR(8191) CEA/CNRS/UJF/Grenoble INP, INAC, 17 rue des Martyrs, 38054 Grenoble (France)
  2. Applied Materials SGG CTO, Les Jardins d'Entreprise 11b, Chemin de la Dhuy 38246 Meylan Cedex (France)
  3. Applied Materials SSG CTO, 974 E Arques avenue, Sunnyvale, California 94085 (United States)
Publication Date:
OSTI Identifier:
22273874
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; COBALT COMPOUNDS; COMPARATIVE EVALUATIONS; CURRENT DENSITY; ELECTRIC CONTACTS; ELECTRIC CURRENTS; HETEROJUNCTIONS; INTERFACES; IRON BORIDES; LAYERS; MAGNESIUM OXIDES; MAGNETIZATION; PHASE DIAGRAMS; PULSES; SPIN; TORQUE; TUNNEL EFFECT