Exploring the microscopic origin of exchange bias with photo-electron emission microscopy (PEEM)

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It is well known that magnetic exchange coupling across the ferromagnet--antiferromagnet interface results in a unidirectional magnetic anisotropy of the ferromagnetic layer, called exchange bias. Despite large experimental and theoretical efforts, the origin of exchange bias is still controversial, mainly because detection of the interfacial magnetic structure is difficult. We have applied photoelectron emission microscopy (PEEM) on several ferromagnet - antiferromagnet thin-film structures and microscopically imaged the ferromagnetic and the antiferromagnetic structure with high spatial resolution. Taking advantage of the surface sensitivity and elemental specificity of PEEM, the magnetic configuration and critical properties such as the Neel temperature were determined ... continued below

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11 pages

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Scholl, A.; Nolting, F.; Stohr, J.; Regan, T.; Luning, J.; Seo, J.W. et al. January 22, 2001.

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Description

It is well known that magnetic exchange coupling across the ferromagnet--antiferromagnet interface results in a unidirectional magnetic anisotropy of the ferromagnetic layer, called exchange bias. Despite large experimental and theoretical efforts, the origin of exchange bias is still controversial, mainly because detection of the interfacial magnetic structure is difficult. We have applied photoelectron emission microscopy (PEEM) on several ferromagnet - antiferromagnet thin-film structures and microscopically imaged the ferromagnetic and the antiferromagnetic structure with high spatial resolution. Taking advantage of the surface sensitivity and elemental specificity of PEEM, the magnetic configuration and critical properties such as the Neel temperature were determined on LaFeO{sub 3} and NiO thin films and single crystals. On samples coated with a ferromagnetic layer, we microscopically observe exchange coupling across the interface, causing a clear correspondence of the domain structures in the adjacent ferromagnet and antiferromagnet. Field dependent measurements reveal a strong uniaxial anisotropy in individual ferromagnetic domains. A local exchange bias was observed even in not explicitly field-annealed samples, caused by interfacial uncompensated magnetic spins. These experiments provide highly desired information on the relative orientation of electron spins at the interface between ferromagnets and antiferromagnets.

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11 pages

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OSTI as DE00775145

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  • 8th Joint MMM-Internag Conference, San Antonio, TX (US), 01/07/2001--01/11/2001; Other Information: Supercedes report DE00775145; PBD: 22 Jan 2001;Journal of Applied Physics, Vol. 89, No. 11, pp. 7266-7268, June 1, 2001

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  • Report No.: LBNL--46504
  • Report No.: LBNL/ALS-43333
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 775145
  • Archival Resource Key: ark:/67531/metadc723950

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 22, 2001

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

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  • April 5, 2016, 1:21 p.m.

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Scholl, A.; Nolting, F.; Stohr, J.; Regan, T.; Luning, J.; Seo, J.W. et al. Exploring the microscopic origin of exchange bias with photo-electron emission microscopy (PEEM), article, January 22, 2001; California. (digital.library.unt.edu/ark:/67531/metadc723950/: accessed December 10, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.