Title: Magnetotransport and magnetic textures in Ho/FeCoGd/β-W multilayers

Abstract

The enhancement of interfacial Dzyaloshinskii-Moriya Interaction (DMI) in magnetic multilayers results in the stabilization of topological spin textures such as chiral domain walls and skyrmions. Here we report on the evaluation of interface-driven magnetic interactions in a uniquely designed multilayer where each magnetic layer of two antiferromagnetically coupled sublattices of 3d and 4f moments is sandwiched between the layers of β-tungsten and holmium whose spin Hall angles are large but opposite in sign. Here, the atomic and magnetic periodicity of these multilayers is established by polarized neutron reflectivity measurements and the presence of a labyrinth domain spin texture of zero remanence with x-ray photoelectron microscopy. Measurements of the Hall resistivity [ρ_xy(T,H)] together with static magnetization [M(T,H)] over a broad range of temperature (T) and magnetic field (H) indicate impending compensation between 3d and 4f sublattices at T > 350 K. These multilayers are characterized by a small (0.04%) but positive magnetoresistance indicative of interface enhanced scattering, and a large (40 nΩm) and negative anomalous ρ_xy(T,H) which results from a parallel alignment of 4f moments with the external magnetic field. No distinct scaling is seen between ρ_xy(T,H), ρ_xx(T,H), and M(T,H) at temperatures above 200 K where the magnetization develops out ofmore » plane anisotropy. The field scans of ρ_xy at T > 200 K show a distinct cusp in the vicinity of magnetic saturation. These Hall data have been analyzed in the framework of a model where a distinct topological contribution to ρ_xy rides over the anomalous Hall resistivities of the 3d and 4f magnetic sublattices. It is suggested that this apparent topological effect results from an interfacial DMI and dominates ρ_xy(T,H) in the temperature regime where the 3d and 4f lattices are nearly compensated.« less

Authors:

Budhani, Ramesh C. ^[1]; Sharma, Vinay  ^[1];

• Search DOE PAGES for author "Sharma, Vinay"
• Search DOE PAGES for ORCID "0000-0003-4735-1003"

Negusse, Ezana ^[1]; Casey, Jacob ^[2]; Pathak, Arjun K.  ^[2];

• Search DOE PAGES for author "Pathak, Arjun K."
• Search DOE PAGES for ORCID "0000-0003-0690-7300"

Sadowski, Jerzy T.  ^[3];

• Search DOE PAGES for author "Sadowski, Jerzy T."
• Search DOE PAGES for ORCID "0000-0002-4365-7796"

Kirby, Brian ^[4]

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+ Show Author Affiliations

1. Morgan State Univ., Baltimore, MD (United States)
2. SUNY Buffalo State, NY (United States)
3. Brookhaven National Lab. (BNL), Upton, NY (United States)
4. NIST Center for Neutron Research, Gaithersburg, MD (United States)

Publication Date:

Wed Jan 12 00:00:00 EST 2022

Research Org.:

Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Org.:

USDOE Office of Science (SC)

OSTI Identifier:

1847165

Report Number(s):

BNL-222808-2022-JAAM
Journal ID: ISSN 2469-9950; TRN: US2305203

Grant/Contract Number:  

SC0012704

Resource Type:

Accepted Manuscript

Journal Name:

Physical Review. B

Additional Journal Information:

Journal Volume: 105; Journal Issue: 2; Journal ID: ISSN 2469-9950

Publisher:

American Physical Society (APS)

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE; Anomalous Hall effect; Dzyaloshinskii-Moriya interaction; Electrical conductivity; Multilayer thin films; Magnetization measurements