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Title: Role of the antiferromagnetic pinning layer on spin wave properties in IrMn/NiFe based spin-valves

Brillouin light scattering (BLS) was exploited to study the spin wave properties of spin-valve (SV) type samples basically consisting of two 5 nm-thick NiFe layers (separated by a Cu spacer of 5 nm), differently biased through the interface exchange coupling with an antiferromagnetic IrMn layer. Three samples were investigated: a reference SV sample, without IrMn (reference); one sample with an IrMn underlayer (10 nm thick) coupled to the bottom NiFe film; one sample with IrMn underlayer and overlayer of different thickness (10 nm and 6 nm), coupled to the bottom and top NiFe film, respectively. The exchange coupling with the IrMn, causing the insurgence of the exchange bias effect, allowed the relative orientation of the NiFe magnetization vectors to be controlled by an external magnetic field, as assessed through hysteresis loop measurements by magneto-optic magnetometry. Thus, BLS spectra were acquired by sweeping the magnetic field so as to encompass both the parallel and antiparallel alignment of the NiFe layers. The BLS results, well reproduced by the presented theoretical model, clearly revealed the combined effects on the spin dynamic properties of the dipolar interaction between the two NiFe films and of the interface IrMn/NiFe exchange coupling.
Authors:
;  [1] ;  [2] ;  [3] ; ; ; ;  [4] ;  [4] ;  [3]
  1. Istituto Officina dei Materiali del CNR (IOM-CNR), Unità di Perugia, I-06123 Perugia (Italy)
  2. Department of Physics and Astronomy, University of Bologna, I-40127 Bologna (Italy)
  3. (Italy)
  4. Department of Physics and Earth Sciences and CNISM, University of Ferrara, I-44122 Ferrara (Italy)
Publication Date:
OSTI Identifier:
22410073
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 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; ANTIFERROMAGNETISM; BRILLOUIN EFFECT; COPPER; COUPLING; FILMS; HYSTERESIS; INTERFACES; INTERMETALLIC COMPOUNDS; IRIDIUM; IRON; LAYERS; LIGHT SCATTERING; MAGNETIC FIELDS; MAGNETIZATION; MAGNETO-OPTICAL EFFECTS; MAGNETORESISTANCE; MANGANESE; NICKEL; SPIN; SPIN WAVES