Spin valve with a composite dysprosium-based pinned layer as a tool for determining Dy nanolayer helimagnetism

• Published in: Current applied physics Vol. 19; no. 11; pp. 1252 - 1258
• Main Authors: Naumova, L.I., Milyaev, M.A., Zavornitsyn, R.S., Krinitsina, T.P., Proglyado, V.V., Ustinov, V.V.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2019; 한국물리학회
• Subjects: Dysprosium; Helical ordering; Magnetoresistance; Nanostructure; Neel temperature; 물리학; Neel temperature; Nanostructure; Dysprosium; Magnetoresistance; Helical ordering
• ISSN: 1567-1739; 1878-1675
• DOI: 10.1016/j.cap.2019.08.012

Spin valves with nanostructure CoFe/Dy/CoFe and three-layer structures metal/Dy/metal were prepared by magnetron sputtering. The measurements of field dependences of magnetoresistance and magnetization were held at different temperatures. The changes of magnetotransport properties of spin valve containing CoFe/Dy/CoFe structure were used for getting information on the magnetic ordering in the dysprosium layer. The characteristic changes of magnetotransport properties caused by the formation of helical ordering in dysprosium layer were detected. Special attention was paid to the estimation of Neel temperature and to the investigation of microstructure of dysprosium nanolayer. •Neel temperature for the dysprosium layer with thickness 40 nm surrounded by Ta, NiFe and CoFe layers is 152, 157 and 154 K.•The magnetotransport properties of spin valve containing Dy layer were used for getting information on the magnetic ordering in dysprosium.•In spin valve containing nanostructure CoFe/Dy/CoFe the Dy layer at T < 133 K reveals properties of antiferromagnet.•Noncollinear magnetic structure forms in polycrystalline dysprosium nanolayer.