Magnetoresistance in magnetic nanoconstrictions: The role of structural defects

Abstract

The resistance of a ferromagnetic cylindrical Ni nano-constriction has been measured as a function of the external magnetic field. Typical profiles of the resistance versus external field are observed with irreversible jumps separated by stable plateaus, showing systematic slow relaxation effects. An interpretation in terms of magnetomechanical strain at the level of the constriction is proposed. This scenario allows the slow relaxation behaviour to be understood in terms of displacement of dislocations or similar metastable structural defects. V C 2013 AIP Publishing LLC.

Differences in fundamental reaction mechanisms between high and low-LET in recent advancements and applications of ionizing radiation

“…33 These constrictions are also under study with respect to their ability to trap domain walls or to create a tunneling effect. 34 Upon lowering the ion flux during SHI irradiation and cutting the beam at the right time, single track polymer membranes can be obtained. A single nanopore in a solid state polymer is of great interest nowadays for fundamental studies related to DNA sequencing or protein refolding, as well as conductivity properties.…”

Strain-induced inverse magnetostriction measured on a single contacted Ni nanowire in a polymer matrix

“…Thanks to the magnetoresistance properties, it is possible to access to the magnetization states of a nano-magnet via voltage measurements, with unprecedented sensitivity [12][13][14][15][16][17][18][19]. The relation that links the resistance to the magnetization vector M is given by the formula R(M) = R min + R cos 2…”

“…In particular, the possibility of controlling the magnetization with piezoelectric means (especially through the so called inverse magnetostriction effect) is a promising technique for data storage and data processing applications [6][7][8][9][10]. On the other hand, the nanotechnology approach based ion-track shaping of polymer templates has proven to be very efficient for investigating the physical properties of magnetic nanostructures [11][12][13][14][15][16][17]. A systematic study of the physical properties of singlecontacted magnetic nanowires embedded in an active thermoelastic and piezoelectric polymer matrix is reported.…”