YBa2Cu3O7 and Nb NanoSQUIDs for the Investigation of Magnetization Reversal of Individual Magnetic Nanoparticles

Müller, B. ; Lin, J. ; Linek, J. ; Karrer, M. ; Limberger, F. ; Koch, L. ; Goldobin, E. ; Kleiner, R. ; Koelle, D. ; Morosh, V. ; Weimann, T. ; Kieler, O.F. ; Sesé, J. (Universidad de Zaragoza) ; Martínez-Pérez, M.J. (Universidad de Zaragoza)

Resumen: We report on the fabrication, performance and application of sensitive YBa2Cu3O7 (YBCO) and Nb nanoSQUIDs to magnetization reversal measurements of individual magnetic nanoparticles. The YBCO SQUIDs are based on grain boundary Josephson junctions and are patterned in a single layer of epitaxially grown YBCO films by Ga focused ion beam milling. The Nb SQUIDs contain sandwich-type Josephson junctions with normal conducting HfTi barriers; they are fabricated with a multilayer technology that includes patterning by e-beam lithography and a combination of milling techniques and chemical-mechanical polishing. Due to the small inductance of the SQUID loops, ultralow white flux noise at 4.2 K can be achieved, which yields spin sensitivities of down to a few Bohr magnetons per unit bandwidth for a magnetic nanoparticle placed at 10 nm distance to the SQUID loop.

Idioma: Inglés

DOI: 10.1109/ISEC46533.2019.8990906

Año: 2019

Publicado en: IEEE ... International Superconductive Electronics Conference 2019, 19424654 (2019), [3 pp]
ISSN: 2374-4952

Financiación: info:eu-repo/grantAgreement/EUR/COST-Action/CA16218-Nanocohybri

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)