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Magnetic reversal in Dy-doped DyFe2/YFe2 superlattice films

DOI: 10.1103/PhysRevB.91.094403 DOI Help

Authors: G. B. G. Stenning (ISIS) , G. J. Bowden (University of Southampton) , P. A. J. De Groot (University of Southampton) , G. Van Der Laan (Diamond Light Source) , A. I. Figueroa (Diamond Light Source) , P. Bencok (Diamond Light Source) , P. Steadman (Diamond Light Source) , T. Hesjedal (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 91 (9) , PAGES 094403

State: Published (Approved)
Published: March 2015
Diamond Proposal Number(s): 9875

Abstract: Reversible magnetic exchange springs can be formed in the magnetically soft YFe2 layers of epitaxial DyFe2/YFe2 multilayer films. Here we show that the insertion of just two monolayers of DyFe2, placed directly in the middle of the YFe2 layers, brings about substantial changes. Results are presented for a Dy-doped (110)-oriented [DyFe2(60A° )/YFe2(120A° )/DyFe2(8A° )/YFe2(120A° )]15 multilayer film, measured at 100 K in fields of up to ±10 T. Using bulk magnetometry, micromagnetic modeling, and Dy-specific x-ray magnetic circular dichroism, it is shown that Dy doping substantially increases the number of spin states available to the system. Altogether 12 distinct spring states are identified which bring additional complexity to the magnetic reversal process. In particular, the exchange springs are no longer reversible, exhibiting magnetic exchange-spring collapse. Full and partial magnetic loops are presented for fields applied along the in-plane easy [001] axis and the in-plane hard [¯110] axis. In particular, it is demonstrated that exchange-spring collapse is sharpest when the field is applied along a hard in-plane [¯110] axis.

Journal Keywords: XMCD

Subject Areas: Physics, Materials, Information and Communication Technology

Instruments: I10-Beamline for Advanced Dichroism

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