arXiv subjects

M. Venkata Kamalakar

Publications and source records attributed to M. Venkata Kamalakar.

21 records · Page 2Linked to original sources

arXiv2009

Resistance fluctuations and 1/f noise in single crystalline Ni nanowires

We measured the low frequency (10mHz < f < 10Hz) resistance fluctuations (Noise) in single crystalline ferromagnetic Ni nanowires (diameter ~35nm) in the temperature range 80K-300K. The noise spectral power shows 1/f dependence. The nanowires in an applied magnetic field show negative magetoresistance that saturates for H <= HC. The noise spectral power shows a reduction in low applied field and becomes field independent for H >= HC. This indicates that a part of the observed 1/f noise arises from magnetic origin. The magnetic part is associated with thermally activated domain wall fluctuations that couples to the resistance fluctuations.

cond-mat.mes-hall↗

arXiv2009

Temperature dependent electrical resistivity of a single strand of ferromagnetic single crystalline nanowire

We have measured the electrical resistivity of a single strand of a ferromagnetic Ni nanowire of diameter 55 nm using a 4-probe method in the temperature range 3 K-300 K. The wire used is chemically pure and is a high quality oriented single crystalline sample in which the temperature independent residual resistivity is determined predominantly by surface scattering. Precise evaluation of the temperature dependent resistivity ($ρ$) allowed us to identify quantitatively the electron-phonon contribution (characterized by a Debye temperature $θ_R$) as well as the spin-wave contribution which is significantly suppressed upon size reduction.

cond-mat.mes-hall↗

arXiv2008

Electrical resistance of Ni nanowires (diameter greater than or equal to 20 nm) near the Curie Temperatures

In this letter we report electrical transport measurements on nickel nanowires of diameters down to 20 nm in the region close to its paramagnetic-ferromagnetic transition temperature T_C (reduced temperature|t| less than or equal to 0.001). The data analysis done in the frame work of critical behavior of resistance near TC shows that the critical behavior persists even down to the lowest diameter wire of 20 nm. However, there is a suppression of the critical behavior of the resistivity as measured by the critical exponents and the parameters quantifying the anomaly. The spin system shows approach to a quasi one-dimensional spin system.

cond-mat.mtrl-sci↗