Anisotropy magnetoresistance of quantum ballistic nickel nanocontacts

Yang, Cheol‐Soo; Zhang, C.; Redepenning, Jody; Doudin, B.

doi:10.1016/j.jmmm.2004.09.133

Cited by 8 publications

(11 citation statements)

References 13 publications

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“…1a) 10,19 . A Co fi lm was then electrodeposited to close the gap between the electrodes using a cobalt sulphate electroplating bath under constant voltage conditions.…”

Section: E T H O D S Experimentsmentioning

confidence: 99%

“…Of signifi cant concern is the possibility of creating conductance changes as a result of mechanical displacements of the electrodes 18,19,26 . Our experimental set up, in which the electrodes are bonded to the substrate, minimizes mechanical effects 19 .…”

Section: E T H O D S Experimentsmentioning

confidence: 99%

“…Our experimental set up, in which the electrodes are bonded to the substrate, minimizes mechanical effects 19 . The magnetostrictive change of the size of the nanocontact can be estimated by multiplying the length of unbound part of the contact by the saturation magnetostriction coefficient, resulting in a value smaller than 0.1 Å for Co.…”

Section: E T H O D S Experimentsmentioning

confidence: 99%

“…Tremendous scientifi c activity in this fi eld has resulted in the design of new electronics architecture using magnetic elements 16 , the electric-fi eld control of spin transport 17 and a debate regarding the nature of magnetoresistive phenomena in atomic-scale metallic structures 18 . Although the control of composition and magnetism at the atomic level is extremely challenging, a systematic trend in experimental results reveals that nanocontact resistance depends on the relative directions of the saturation magnetization and the electric current 19,20,21,22 . This anisotropy in the resistance is reminiscent of the anisotropic magnetoresistance (AMR) effect that has been known for bulk ferromagnets since the middle of the nineteenth century 23 .…”

mentioning

confidence: 99%

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Quantized magnetoresistance in atomic-size contacts

et al. 2007

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“…1a) 10,19 . A Co fi lm was then electrodeposited to close the gap between the electrodes using a cobalt sulphate electroplating bath under constant voltage conditions.…”

Section: E T H O D S Experimentsmentioning

confidence: 99%

Section: E T H O D S Experimentsmentioning

confidence: 99%

Section: E T H O D S Experimentsmentioning

confidence: 99%

mentioning

confidence: 99%

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Quantized magnetoresistance in atomic-size contacts

et al. 2007

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“…1). Full data and details for fabricating Ni, Co, or Ag metallic nanobridges down the few atoms size are presented in our previous work (8)(9)(10)(11), and more details are given in SI Text. More specifically, diminution of the initial gap between the two nearby patterned working electrodes occurs by reduction of Ni ++ ions under constant negative potential V close , referred to a Pt or Ag/Cl electrode (R, Fig.…”

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confidence: 99%

The magnetoelectrochemical switch

Popa¹,

Kemp

Majjad

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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In the field of spintronics, the archetype solid-state two-terminal device is the spin valve, where the resistance is controlled by the magnetization configuration. We show here how this concept of spin-dependent switch can be extended to magnetic electrodes in solution, by magnetic control of their chemical environment. Appropriate nanoscale design allows a huge enhancement of the magnetic force field experienced by paramagnetic molecular species in solutions, which changes between repulsive and attractive on changing the electrodes' magnetic orientations. Specifically, the field gradient force created within a sub-100-nm-sized nanogap separating two magnetic electrodes can be reversed by changing the orientation of the electrodes' magnetization relative to the current flowing between the electrodes. This can result in a breaking or making of an electric nanocontact, with a change of resistance by a factor of up to 10 3 . The results reveal how an external field can impact chemical equilibrium in the vicinity of nanoscale magnetic circuits.magnetohydrodynamics | supramolecular chemistry | electrochemistry S pintronics (1, 2) is a mature research field in solid-state physics, with important electronic device applications. Spindependent transport studies in a liquid environment are much scarcer, and still rely on solid-state spintronics devices concepts. For example, giant magnetoresistance or tunnel magnetoresistance spin valves (3) are used for detecting the stray magnetic field (4) of nearby micrometer-sized (bioactive) magnetic beads (5). The objects studied are significantly larger than the molecular scale, owing to the predominant concentration gradient and Brownian forces exceeding by orders of magnitudes the magnetic force experienced by paramagnetic molecules (6). However, miniaturization of ferromagnetic elements below the micrometer range provides opportunities for enhancing the magnetic force field, making the detection of single spin possible (7). We propose here to use such a nanoscale enhancement strategy to investigate how the realization of very large magnetic field gradients can impact the properties of paramagnetic molecules, in particular by modifying their chemical equilibrium. An external magnetic field controls the magnetization direction of ferromagnetic immersed electrodes, with a related large change of the magnetic forces in their vicinity. This modifies accordingly the chemical stability of the solution, in the interesting case where paramagnetic molecules are essential to the construction of a conductive molecular-sized system. The resulting metallic nanobridge therefore exhibits electrical properties tunable through a change of magnetic orientations of the electrodes. While it relies on a totally different physical origin, this is the chemical analog of a solid-state spin valve device.We illustrate this concept by presenting magnetoresistance (MR) results for a Ni-based nanobrige separating two nearby Ni electrodes immersed in an electrochemical solution. The experiments are based up...

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Magnetostriction and magnetoresistance in nanocontacts

Zhu¹,

Di²

2006

Journal of Magnetism and Magnetic Materials

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Anisotropy magnetoresistance of quantum ballistic nickel nanocontacts

Cited by 8 publications

References 13 publications

Quantized magnetoresistance in atomic-size contacts

Quantized magnetoresistance in atomic-size contacts

The magnetoelectrochemical switch

Magnetostriction and magnetoresistance in nanocontacts

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