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Title: Control of magnetic relaxation by electric-field-induced ferroelectric phase transition and inhomogeneous domain switching

Electric-field modulation of magnetism in strain-mediated multiferroic heterostructures is considered a promising scheme for enabling memory and magnetic microwave devices with ultralow power consumption. However, it is not well understood how electric-field-induced strain influences magnetic relaxation, an important physical process for device applications. Here, we investigate resonant magnetization dynamics in ferromagnet/ferroelectric multiferroic heterostructures, FeGaB/PMN-PT and NiFe/PMN-PT, in two distinct strain states provided by electric-field-induced ferroelectric phase transition. The strain not only modifies magnetic anisotropy but also magnetic relaxation. In FeGaB/PMN-PT, we observe a nearly two-fold change in intrinsic Gilbert damping by electric field, which is attributed to strain-induced tuning of spin-orbit coupling. By contrast, a small but measurable change in extrinsic linewidth broadening is attributed to inhomogeneous ferroelastic domain switching during the phase transition of the PMN-PT substrate.
Authors:
; ; ; ; ; ; ;  [1] ; ;  [2] ; ;  [3] ;  [4] ; ; ;  [5]
  1. Department of Electrical and Computer Engineering, Northeastern University, Boston, Massachusetts 02115 (United States)
  2. Electronic Materials Research Laboratory, Xi'an Jiaotong University, Xi'an 710049 (China)
  3. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800 (China)
  4. Department of Chemistry, Northeastern University, Boston, Massachusetts 02115 (United States)
  5. Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433 (United States)
Publication Date:
OSTI Identifier:
22489247
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 1; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANISOTROPY; CONTROL; DAMPING; ELECTRIC FIELDS; FERROELECTRIC MATERIALS; L-S COUPLING; MAGNETISM; MAGNETIZATION; MICROWAVE RADIATION; MODULATION; PHASE TRANSFORMATIONS; RELAXATION; STRAINS; SUBSTRATES; TUNING