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Exchange spring switching in Er-doped DyFe2/YFe2 magnetic thin films

DOI: 10.1103/PhysRevB.92.104404 DOI Help

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

Type: Journal Paper
Journal: Physical Review B , VOL 92 (10) , PAGES 104404

State: Published (Approved)
Published: September 2015
Diamond Proposal Number(s): 8213

Abstract: Reversible magnetic exchange springs can be formed in multilayer films, grown by molecular beam epitaxy. Here we demonstrate that small amounts of anisotropic ErFe2, placed in the middle of the YFe2 magnetic exchange springs, can bring about substantial changes. Results are presented for an Er-doped (110)-oriented multilayer film, at 100 K in fields of up to ±14 T. Using both Er and Dy-specific soft x-ray magnetic circular dichroism and micromagnetic modeling, it is demonstrated that Er doping gives rise to (i) noncollinear exchange spring states in zero field, (ii) magnetic exchange spring collapse, (iii) a marked increase in the number of different exchange spring states available to the system, and (iv) strikingly different Er and Dy magnetization loops. Full and partial loops are presented for both the in-plane hard and easy axes. The magnetization loops for Dy sublattice show that at least ten different exchange spring states are accessed during magnetic reversal. Magnetic switching scenarios, involving mixtures of Neel-like and Bloch-like domain walls, are presented and discussed.

Journal Keywords: XMCD

Subject Areas: Physics, Materials, Information and Communication Technology

Instruments: I10-Beamline for Advanced Dichroism