Universität zu Köln

Gorkov, D., Toperverg, B. P. and Zabel, H. (2020). Probing interspatial magnetic flux distributions in ferromagnetic stripe arrays by specular and off-specular polarized neutron scattering. Phys. Rev. B, 101 (22). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

Edge roughness in magnetic stripe arrays is an important structural parameter with a sizable impact on magnetic domains, domain correlation, pinning and propagation of domain walls in micro- and nanostripes proposed for data storage and logic devices. We have investigated two different stripe arrays fabricated by lithographic methods from permalloy Fe22Ni78, one with rough edges and another one with smooth edges. Performing polarized neutron reflectivity and polarized neutron off-specular scattering both patterns yield specular reflectivity curves with pronounced Kiessig fringes and well resolved Bragg bands in the off-specular regime due to the lateral periodicity. When applying a saturating magnetic field perpendicular to the stripes, a significant diffuse scattering can be detected close to the total reflection edge where it is enhanced by the Yoneda effect. This diffuse magnetic scattering can be attributed to inhomogeneities of the magnetic induction in the empty space between the stripes. In contrast, the sample with much less edge roughness does not exhibit off-specular diffuse scattering. Thus polarized neutron scattering from stripe patterns is a suitable tool for quantitative characterization of inhomogeneous magnetic flux distribution in the interspace between magnetic stripes invoked by their edge roughness.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Gorkov, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Toperverg, B. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zabel, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-330790
DOI:	10.1103/PhysRevB.101.224404
Journal or Publication Title:	Phys. Rev. B
Volume:	101
Number:	22
Date:	2020
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DOMAIN-WALL; EDGE ROUGHNESS; KERR MICROSCOPY; REFLECTOMETRY; REVERSAL; CO; PROPAGATION; DIFFRACTION; DYNAMICS Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/33079