Reversal Mechanism of an Individual Ni Nanotube Simultaneously Studied by Torque and SQUID Magnetometry

A. Buchter, J. Nagel, D. Rüffer, F. Xue (薛飞), D. P. Weber, O. F. Kieler, T. Weimann, J. Kohlmann, A. B. Zorin, E. Russo-Averchi, R. Huber, P. Berberich, A. Fontcuberta i Morral, M. Kemmler, R. Kleiner, D. Koelle, D. Grundler, and M. Poggio

Phys. Rev. Lett. 111, 067202 – Published 8 August 2013

Abstract

Using an optimally coupled nanometer-scale SQUID, we measure the magnetic flux originating from an individual ferromagnetic Ni nanotube attached to a Si cantilever. At the same time, we detect the nanotube’s volume magnetization using torque magnetometry. We observe both the predicted reversible and irreversible reversal processes. A detailed comparison with micromagnetic simulations suggests that vortexlike states are formed in different segments of the individual nanotube. Such stray-field free states are interesting for memory applications and noninvasive sensing.

Received 14 May 2013

DOI:https://doi.org/10.1103/PhysRevLett.111.067202

Authors & Affiliations

A. Buchter¹, J. Nagel², D. Rüffer³, F. Xue (薛飞)¹, D. P. Weber¹, O. F. Kieler⁴, T. Weimann⁴, J. Kohlmann⁴, A. B. Zorin⁴, E. Russo-Averchi³, R. Huber⁵, P. Berberich⁵, A. Fontcuberta i Morral³, M. Kemmler², R. Kleiner², D. Koelle², D. Grundler^5,6,*, and M. Poggio^1,†

¹Department of Physics, University of Basel, 4056 Basel, Switzerland
²Physikalisches Institut and Center for Collective Quantum Phenomena in LISA+, Universität Tübingen, 72076 Tübingen, Germany
³Laboratoire des Matériaux Semiconducteurs, Institut des Matériaux, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
⁴Fachbereich 2.4 “Quantenelektronik”, Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany
⁵Lehrstuhl für Physik funktionaler Schichtsysteme, Physik Department E10, Technische Universität München, 85747 Garching, Germany
⁶Institut des Matériaux, Faculté Sciences et Technique de l’Ingénieur, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

^*grundler@ph.tum.de
^†martino.poggio@unibas.ch

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Vol. 111, Iss. 6 — 9 August 2013

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