Nanoscale magnetization inhomogeneity within single phase nanopillars

Farmer, Thomas O.; Guo, Erjia; Desautels, Ryan D.; Debeer-Schmitt, Lisa M.; Chen, Aiping; Wang, Zhongchang; Gilbert, Dustin A.; Fitzsimmons, Michael R.; Jia, Quanxi; Borchers, Julie A.; Holladay, Ben; Sinha, Sunil K.

doi:10.1103/PhysRevMaterials.3.081401

Nanoscale magnetization inhomogeneity within single phase nanopillars

Journal Article · Thu Aug 01 00:00:00 EDT 2019 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.3.081401· OSTI ID:1560508

^[1]; ^[2]; ^[3]; ^[4]; Chen, Aiping ^[5]; Wang, Zhongchang ^[6]; Gilbert, Dustin A. ^[7]; ^[8]; Jia, Quanxi ^[9]; Borchers, Julie A. ^[10]; Holladay, Ben ^[11]; Sinha, Sunil K. ^[11]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); STFC Rutherford Appleton Lab., Didcot (United Kingdom)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Chinese Academy of Sciences, Beijing (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Seagate Tech., Derry (United Kingdom)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
International Iberian Nanotechnology Lab, Braga (Portugal)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Univ. at Buffalo, Buffalo, NY (United States); Konkuk Univ., Seoul (Republic of Korea)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Univ. of California, San Diego, La Jolla, CA (United States)

We report observation of a radial dependence in the magnetic anisotropy of epitaxially strained CoFe₂O₄ nanopillars in a BaTiO₃ matrix. This archetypal example of a multiferroic heterostructure with a self-assembling three-dimensional architecture possesses significant out-of-plane uniaxial magnetic anisotropy. Here, the anisotropy originates from the large magnetostriction of CoFe₂O₄ and the state of stress within the nanocomposite. Magnetometry suggests the existence of two magnetic phases with different anisotropies. Micromagnetic simulations of a core-shell magnetic anisotropy qualitatively reproduce features of the magnetic hysteresis and elucidate the magnetization reversal mechanism: The magnetization initially reorients within the pillar core, followed by that of the shell. This is consistent with polarized small-angle neutron scattering which can be described by a CoFe₂O₄ magnetization that is nonuniform on nanometer length scales. As the length scale of inhomogeneity of the magnetic anisotropy is similar to estimates of the relaxation of the displacement field from the CoFe₂O₄–BaTiO₃ interface, stress and its influence on structure provide an important route to new functionality of vertically aligned nanopillars for applications in low-power memory, computing, and sensing.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: LDRD; USDOE

Grant/Contract Number:: 89233218CNA000001; AC05-00OR22725

OSTI ID:: 1560508

Alternate ID(s):: OSTI ID: 1546817
OSTI ID: 1571604

Report Number(s):: LA-UR--19-29646

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 8 Vol. 3; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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