Magnetoresistance of rolled-up Fe sub(3)Si nanomembranes

• Published in: Nanotechnology 2012-06, Vol.23 (25), p.255701-1-5
• Main Authors: Schumann, J, Lisunov, K G, Escoffier, W, Raquet, B, Broto, J M, Arushanov, E, Moench, I, Makarov, D, Deneke, C, Schmidt, O G
• Format: Article
• Language: English
• Subjects: Critical temperature
• ISSN: 0957-4484
• DOI: 10.1088/0957-4484/23/25/255701

Magnetotransport of individual rolled-up Fe sub(3)Si nanomembranes is investigated in a broad temperature range from 4.2 K up to 300 K in pulsed magnetic fields up to 55 T. The observed magnetoresistance (MR) has the following pronounced features: (i) MR is negative in the investigated intervals of temperature and magnetic field; (ii) its magnitude increases linearly with the magnetic field in a low-field region and reveals a gradual trend to saturation when the magnetic field increases; (iii) the MR effect becomes more pronounced with increasing temperature. These dependences of MR on the magnetic field and temperature are in line with predictions of the spin-disorder model of the spin-flip s-d interaction assisted with creation or annihilation of magnons, which is expected above a certain critical temperature. Comparison of the MR features in rolled-up and planar samples reveals a substantial increase of the critical temperature in the rolled-up tube, which is attributed to a new geometry and internal strain arising in the rolled-up nanomembranes, influencing the electronic and magnetic properties of the material.