Artifacts that mimic ballistic magnetoresistance

Egelhoff, William F.; Gan, L; Ettedgui, Hanania; Kadmon, Y.; Powell, Cedric J.; Chen, P J.; Shapiro, Alexander J.; McMichael, Robert D.; Mallett, Jonathan J.; Moffat, Thomas P.; Stiles, Mark D.; Svedberg, Erik B.

doi:10.1016/j.jmmm.2004.10.082

Cited by 19 publications

(17 citation statements)

References 11 publications

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“…of a field and cause large resistance changes [387,388]. These particles could be transferred to unplated contacts and similar, BMR-like effects, found.…”

Section: Experimental Explorationsupporting

confidence: 60%

Spin-polarised currents and magnetic domain walls

Marrows

2005

Advances in Physics

213

163

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Electrical currents flowing in ferromagnetic materials are spinpolarised as a result of the spin-dependent band structure. When the spatial direction of the polarisation changes, in a domain structure, the electrons must somehow accommodate the necessary change in direction of their spin angular momentum as they pass through the wall. Reflection, scattering, and a transfer of angular momentum to the lattice are all possible outcomes, depending on the circumstances. This gives rise to a variety of different physical effects, most importantly a contribution to the electrical resistance caused by the wall, and a motion of the wall driven by the spin-polarised current.Historical and recent research on these topics is reviewed. * Phone: +44(0)113 3433780

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“…of a field and cause large resistance changes [387,388]. These particles could be transferred to unplated contacts and similar, BMR-like effects, found.…”

Section: Experimental Explorationsupporting

confidence: 60%

Spin-polarised currents and magnetic domain walls

Marrows

2005

Advances in Physics

213

163

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“…The nonmonotonous and smooth behavior is comparable in size and shape to the characteristics observed in stable atomic contacts made of bulk ferromagnets [32][33][34][35]. However, alike contacts made of band ferromagnets, they sometimes display sudden conductance jumps, which were interpreted as signs of rapid geometric contact rearrangements due to magnetostriction [36,37] or other disturbances [38]. This similarity supports the hypothesis of the presence of a local magnetic order in the constriction.…”

Section: Resultssupporting

confidence: 73%

Magnetism in Pd: Magnetoconductance and transport spectroscopy of atomic contacts

et al. 2016

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Since the rapid technological progress demands for ever smaller storage units, the emergence of stable magnetic order in nanomaterials down to the single-atom regime has attracted huge scientific attention to date. Electronic transport spectroscopy has been proven to be a versatile tool for the investigation of electronic, magnetic, and mechanical properties of atomic contacts. Here we report a comprehensive experimental study of the magnetoconductance and electronic properties of Pd atomic contacts at low temperature. The analysis of electronic transport (d/ fdV) spectra and the magnetoconductance curves yields a diverse behavior of Pd single-atom contacts, which is attributed to different contact configurations. The magnetoconductance shows a nonmonotonous but mostly continuous behavior, comparable to those found in atomic contacts of band ferromagnets. In the dl fdV spectra, frequently, a pronounced zero-bias anomaly (ZBA) as well as an aperiodic and nonsymmetric fluctuation pattern are observed. While the ZBA can be interpreted as a sign of the Kondo effect, suggesting the presence of magnetic impurity, the fluctuations are evaluated in the framework of conductance fluctuations in relation to the magnetoconductance traces and to previous findings in Au atomic contacts. This thorough analysis reveals that the magne~oconductance and transport spectrum of Au atomic contacts can completely be accounted for by conductance fluctuations, while in Pd contacts the presence of local magnetic order is required.

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“…Our results differ significantly from previous experiments that were conducted at room temperature or that employed device geometries that were more sensitive to magnetostriction and magnetostatic forces. [5][6][7][8][9]12 Our device design builds on the approach taken by Pasupathy et al, 16 in which the angle between the moments in the two magnetic electrodes could be manipulated by fabricating them with different shapes so that they undergo magnetic reversal at different values of the applied magnetic field. However, the shapes of the electrodes used in ref 16 were not optimal in that an accurate antiparallel (AP) configuration of the two moments could not be obtained reliably.…”

Section: The Entry Of a Magnetic Domain Wall Into A Nanometer-scale Mmentioning

confidence: 99%

From Ballistic Transport to Tunneling in Electromigrated Ferromagnetic Breakjunctions

et al. 2005

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We fabricate ferromagnetic nanowires with constrictions whose cross section can be reduced gradually from 100 nm to the atomic scale and eventually to the tunneling regime by means of electromigration. These devices are mechanically stable against magnetostriction and magnetostatic effects. We measure magnetoresistances ∼0.3% for 100 × 30 nm 2 constrictions, increasing to a maximum of 80% for atomic-scale widths. These results are consistent with a geometrically-constrained domain wall trapped at the constriction. For the devices in the tunneling regime we observe large fluctuations in MR, between -10 and 85%.

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Artifacts that mimic ballistic magnetoresistance

Cited by 19 publications

References 11 publications

Spin-polarised currents and magnetic domain walls

Spin-polarised currents and magnetic domain walls

Magnetism in Pd: Magnetoconductance and transport spectroscopy of atomic contacts

From Ballistic Transport to Tunneling in Electromigrated Ferromagnetic Breakjunctions

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