Influence of in-plane crystalline quality of an antiferromagnet on perpendicular exchange coupling and exchange bias

M. R. Fitzsimmons; Chris  Leighton; C. F. Majkrzak; J. A. Dura; J. R. Groves; R. W. Springer; P. N. Arendt; V. Leiner; H. Lauter; Ivan K. Schuller; A. Hoffmann; Kai Liu

doi:10.1103/PhysRevB.65.134436

Influence of in-plane crystalline quality of an antiferromagnet on perpendicular exchange coupling and exchange bias

M. R. Fitzsimmons, Chris Leighton, C. F. Majkrzak, J. A. Dura, J. R. Groves, R. W. Springer, P. N. Arendt, V. Leiner, H. Lauter, Ivan K. Schuller, A. Hoffmann, Kai Liu

Chemical Engineering and Materials Science

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Abstract

We have undertaken a systematic study of the influence of in-plane crystalline quality of the antiferromagnet on exchange bias. Polarized neutron reflectometry and magnetometry were used to determine the anisotropies of polycrystalline ferromagnetic (F) Fe thin films exchange coupled to antiferromagnetic (AF) untwinned single crystal (110) FeF₂, twinned single crystal (110) FeF₂ thin films and (110) textured polycrystalline FeF₂ thin films. A correlation between the anisotropies of the AF and F thin films with exchange bias was identified. Specifically, when exchange coupling across the F-AF interface introduces an additional anisotropy axis in the F thin film - one perpendicular to the cooling field, the magnetization reversal mechanism is affected (as observed with neutron scattering) and exchange bias is significantly enhanced.

Original language	English (US)
Article number	134436
Pages (from-to)	134436-134436
Number of pages	8
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	65
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevB.65.134436
State	Published - Mar 2002

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10.1103/PhysRevB.65.134436

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Fitzsimmons, M. R., Leighton, C., Majkrzak, C. F., Dura, J. A., Groves, J. R., Springer, R. W., Arendt, P. N., Leiner, V., Lauter, H., Schuller, I. K., Hoffmann, A., & Liu, K. (2002). Influence of in-plane crystalline quality of an antiferromagnet on perpendicular exchange coupling and exchange bias. Physical Review B - Condensed Matter and Materials Physics, 65(13), 134436-134436. [134436]. https://doi.org/10.1103/PhysRevB.65.134436

Fitzsimmons, MR, Leighton, C, Majkrzak, CF, Dura, JA, Groves, JR, Springer, RW, Arendt, PN, Leiner, V, Lauter, H, Schuller, IK, Hoffmann, A & Liu, K 2002, 'Influence of in-plane crystalline quality of an antiferromagnet on perpendicular exchange coupling and exchange bias', Physical Review B - Condensed Matter and Materials Physics, vol. 65, no. 13, 134436, pp. 134436-134436. https://doi.org/10.1103/PhysRevB.65.134436

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abstract = "We have undertaken a systematic study of the influence of in-plane crystalline quality of the antiferromagnet on exchange bias. Polarized neutron reflectometry and magnetometry were used to determine the anisotropies of polycrystalline ferromagnetic (F) Fe thin films exchange coupled to antiferromagnetic (AF) untwinned single crystal (110) FeF2, twinned single crystal (110) FeF2 thin films and (110) textured polycrystalline FeF2 thin films. A correlation between the anisotropies of the AF and F thin films with exchange bias was identified. Specifically, when exchange coupling across the F-AF interface introduces an additional anisotropy axis in the F thin film - one perpendicular to the cooling field, the magnetization reversal mechanism is affected (as observed with neutron scattering) and exchange bias is significantly enhanced.",

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AU - Fitzsimmons, M. R.

AU - Leighton, Chris

AU - Majkrzak, C. F.

AU - Dura, J. A.

AU - Groves, J. R.

AU - Springer, R. W.

AU - Arendt, P. N.

AU - Leiner, V.

AU - Lauter, H.

AU - Schuller, Ivan K.

AU - Hoffmann, A.

AU - Liu, Kai

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N2 - We have undertaken a systematic study of the influence of in-plane crystalline quality of the antiferromagnet on exchange bias. Polarized neutron reflectometry and magnetometry were used to determine the anisotropies of polycrystalline ferromagnetic (F) Fe thin films exchange coupled to antiferromagnetic (AF) untwinned single crystal (110) FeF2, twinned single crystal (110) FeF2 thin films and (110) textured polycrystalline FeF2 thin films. A correlation between the anisotropies of the AF and F thin films with exchange bias was identified. Specifically, when exchange coupling across the F-AF interface introduces an additional anisotropy axis in the F thin film - one perpendicular to the cooling field, the magnetization reversal mechanism is affected (as observed with neutron scattering) and exchange bias is significantly enhanced.

AB - We have undertaken a systematic study of the influence of in-plane crystalline quality of the antiferromagnet on exchange bias. Polarized neutron reflectometry and magnetometry were used to determine the anisotropies of polycrystalline ferromagnetic (F) Fe thin films exchange coupled to antiferromagnetic (AF) untwinned single crystal (110) FeF2, twinned single crystal (110) FeF2 thin films and (110) textured polycrystalline FeF2 thin films. A correlation between the anisotropies of the AF and F thin films with exchange bias was identified. Specifically, when exchange coupling across the F-AF interface introduces an additional anisotropy axis in the F thin film - one perpendicular to the cooling field, the magnetization reversal mechanism is affected (as observed with neutron scattering) and exchange bias is significantly enhanced.

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Influence of in-plane crystalline quality of an antiferromagnet on perpendicular exchange coupling and exchange bias

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