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Metadata Files

Data Publication

Data for in situ modification of the magnetocrystalline anisotropy in cobalt-ferrite microcrystals

DIGITAL.CSIC

(2025)

Descriptions

We present the in situ modification of the magnetocrystalline anisotropy of iron-rich cobalt-ferrite epitaxial islands by changing their composition. Crystalline cobalt-ferrite spinel islands have been grown by oxygen-assisted molecular beam epitaxy on a Ru(0001) single crystal. The micro-crystals are several micrometers wide with heights of tens of nanometers. Their spatially-resolved vector magnetization is mapped by x-ray magnetic circular dichroism in photoemission microscopy at the L3 absorption edges of Co and Fe. Thick islands present a closure-like magnetic domain structure with the magnetization directions predominantly aligned along the projections of the easy magnetic axes onto the (111) surface plane. Thinner islands are more affected by growth defects and present a more complex domain structure. Upon deposition of additional Fe in an oxygen background pressure, Co is found to segregate out of the spinel islands, while their Fe content increases. This produces a reduction in the magnetocrystalline anisotropy, which manifests as a reorientation of the magnetization directions towards the edges of the islands, reflecting an increased contribution of the shape anisotropy

[Description of methods used for collection/generation of data: ] X-ray absorption spectroscopy and X-ray magnetic circular dichroism in photoemission electron microscopy.

File List: - Characterization of as-grown sample - XAS PEEM Images: Fe, Co, O folders - XAS XMCD Images at 0, 60, and 120 degrees azimuthal rotation: Fe - Growth sequence of LEEM images - Characterization of modified sample - XAS PEEM Images: Fe, Co - XAS XMCD Images at 0, 60, 120 degrees azimuthal rotation: Fe, Co - Micromagnetic simulations - Input files - Auxiliary data - Calibration of counts vs. Channel plates voltage - Logbook of experiments

Keywords

Originally assigned keywords

Cobalt ferrite

Photoemission microscopy

Magnetocrystalline anisotropy

MSL enriched keywords

measured property

cobalt

minerals

chemical elements

iron

oxide mineral

spinel

iron

oxygen

carbon (C)

carbon monoxide

Apparatus

electron microscopy

MSL enriched sub domains i

geochemistry

microscopy and tomography

Source

https://digital.csic.es/handle/10261/377278

Source publisher

DIGITAL.CSIC

DOI

10.20350/digitalcsic/17021

Creators

Mandziak, Anna

Prieto, J. E.

Dávalos, J.Z.

Prieto, Pilar

Foerster, Michael

Aballe, Lucía

De La Figuera, Juan

Contributors

Digital.CSIC

DataManager

Digital.CSIC

HostingInstitution

Citation

Mandziak, A., Prieto, J. E., Dávalos, J. Z., Prieto, P., Foerster, M., Aballe, L., & De La Figuera, J. (2025). Data for in situ modification of the magnetocrystalline anisotropy in cobalt-ferrite microcrystals [Data set]. DIGITAL.CSIC. https://doi.org/10.20350/DIGITALCSIC/17021

Dates

Accepted:

2025-01-21

Available:

2025-01-21

Created:

2017-03

Issued:

2025-01-21

Language

Rights

closedAccess