Regensburg 2013 – scientific programme
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DS: Fachverband Dünne Schichten
DS 32: Poster Session IV: Atomic layer deposition; Organic thin films; Organic Electronics and Phototovoltaics; Organic Materials for Spintronics - from spinterface to devices; Thin film photovoltaic materials and solar cells
DS 32.42: Poster
Thursday, March 14, 2013, 17:00–20:00, Poster B2
Towards Rolled-up Spintronic Devices - Effect of Water on Permalloy and CoPc Layers — •Peter Richter1, Maria Esperanza Navarro Fuentes2, Frank Lungwitz1, Michael Fronk1, Daniel Grimm2, Oliver G. Schmidt2, Dietrich R.T. Zahn1, and Georgeta Salvan1 — 1Semiconductor Physics, TU Chemnitz, 09126 Chemnitz, Germany — 2Institute for Integrative Nanosciences, IFW Dresden, 01069 Dresden, Germany
Using the technique of rolled-up nanotubes, we aim to manufacture spintronic devices made from cobalt phthalocyanine molecules (CoPc) sandwiched between ferromagnetic layers. A thin CoPc layer is deposited on top of a permalloy (Py) electrode by organic molecular beam deposition. To ensure a soft and secure contact, the top electrode is formed by a nickel layer, which is the outer part of a strain engineered nanomembrane that rolls up onto the structure. The roll-up process is triggered by exposing the system to water and thus dissolving a sacrificial germanium oxide contact layer. This preliminary study determines the effect that water will have on the magnetic and optical properties of Py and CoPc. Therefore, Py and CoPc/Py layers on Si were characterized by means of spectroscopic ellipsometry, reflection anisotropy spectroscopy as well as magneto-optical Kerr-effect spectroscopy and magnetometry - once for the fresh samples and once after exposing them together with GeO2 to water for 4 hours. The results obtained demonstrate that an oxide layer grows on Py. The CoPc layers become optically thicker, possibly due to water incorporation. The magnetic coercitivity of both layers, however, remains unchanged.