Ballistic magnetoresistance over 3000% in Ni nanocontacts at room temperature

Chopra, Harsh Deep; Hua, Susan Z.

doi:10.1103/physrevb.66.020403

Cited by 167 publications

(128 citation statements)

References 13 publications

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“…This means that, in addition to the size of the nanocontact, its magnetoresistance is also affected by other factors. The Ni ferromagnetic nanocontacts fabricated by mechanical and electrodeposition methods with magnetoresistance values > 70% at room temperature have been reported [6,7,22]. The applied magnetic field alters the interaction between the two anisotropic interfaces, and the contribution of this change to the BMR of the ferromagnetic nanocontacts can not be ruled out yet.…”

Section: Resultsmentioning

confidence: 99%

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Magnetoresistance of the ferromagnetic nanocontacts fabricated by electrodeposition

et al. 2012

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A "T" shaped micro-gap was fabricated by mechanical polishing between two Cu film electrodes on the surface of single-sided bonded copper. A nano-gap was then fabricated in the prepared micro-gap by resistance feedback controlled electroplating. Finally Ni 80 Fe 20 ferromagnetic nanocontacts of several sizes were fabricated in the prepared nano-gap by resistance feedback controlled electroplating. The magnetoresistance of each Ni 80 Fe 20 ferromagnetic nanocontact was not related to its size. Fabrication of the Ni 80 Fe 20 ferromagnetic nanocontacts in the nano-gap can reduce the contribution of magnetostriction to the magnetoresistance. The magnetoresistance values of the Ni 80 Fe 20 ferromagnetic nanocontacts were as high as those of the Ni ferromagnetic nanocontacts. This implies that the contribution of magnetostriction to the ballistic magnetoresistance of the ferromagnetic nanocontacts can be neglected. The ferromagnetic nanocontacts fabricated in this study, and in other cases, have two anisotropic interfaces on the sides of the nanocontacts. However, the magnetic field can alter the contribution of the interaction between the two anisotropic interfaces to the ballistic magnetoresistance of the ferromagnetic nanocontacts, and this effect can not be ruled out yet. ferromagnetic nanocontacts, resistance feedback controlled electroplating, ballistic magnetoresistance Citation:Cheng H, Yang W, Liu H, et al. Magnetoresistance of the ferromagnetic nanocontacts fabricated by electrodeposition.

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Section: Resultsmentioning

confidence: 99%

“…The BMR effects of ferromagnetic nanocontacts from 70% to 3000% [7], and even up to infinity [9], at room temperature have been reported in recent years. However, some experiments have shown that high BMR at room temperature is because of structural changes in the applied magnetic field and not because of a giant spin valve effect [10,11].…”

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confidence: 99%

Magnetoresistance of the ferromagnetic nanocontacts fabricated by electrodeposition

et al. 2012

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“…The preferred conductance values are indicated by a broad maximum around 1.3G 0 and a second one around 2.5G 0 . Usually, a splitting of these maxima would have been expected because of the so--called ballistic magnetoresistance (BMR) [64,65], where the number of fully transmitted conductance channels changes upon applying a magnetic field. In particular, lifting the spin degeneracy modifies the number of modes for spin-up and spin-down subbands, which manifests itself in a magnetic field dependent opening and closing of discrete conductance channels of the contact leading to discrete conductance steps in the order of e 2 /h [66,67].…”

Section: Ferromagnetic (Co) Single-atom Contactsmentioning

confidence: 99%

Electron Transport in Magnetic Quantum Point Contacts

et al. 2012

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In recent years, the fabrication of novel building blocks for quantum computation-and spintronics devices gained significant attention. The ultimate goal in terms of miniaturization is the creation of single-atom functional elements. Practically, quantum point contacts are frequently used as model systems to study the fundamental electronic transport properties of such mesoscopic systems. A quantum point contact is characterised by a narrow constriction coupling two larger electron reservoirs. In the absence of a magnetic field, the conductance of these quantum point contacts is quantised in multiples of 2e 2 /h, the so-called conductance quantum (G 0 ). However, in the presence of magnetic fields the increased spin-degeneracy often gives rise to a deviation from the idealized behaviour and therefore leads to a change in the characteristic conductance of the quantum point contact. Herein, we illustrate the complex magnetotransport characteristics in quantum point contacts and magnetic heterojunctions. The theoretical framework and experimental concepts are discussed briefly together with the experimental results as well as potential applications.

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“…Bimetallic atomic wires are the most promising objects for construction of new nanoelectronics and spintronics devices [1,2]. Bimetallic atomic nanowires possess the unique magnetic [3,4,8,11] and conductive [2,5] properties, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Bimetallic atomic nanowires possess the unique magnetic [3,4,8,11] and conductive [2,5] properties, i.e. spin polarized tunnel current, spinfiltering properties [5], giant magnetoresistance [2,12] and giant magnetic anisotropy [11].…”

Section: Introductionmentioning

confidence: 99%

Spin-filter state of Au-Co nanowires

2018

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Abstract. Our theoretical study reveals the dependence of quantum conductance of Au-Co nanowires on their atomic structure. The results show the emergence of spin-filter state in one-dimensional Au-Co bimetallic nanowires. We found the existence of two transmission regime in Au-Co nanowires with low and high conductivity 1G 0 and 2G 0 for "zig-zag" and linear nanowire correspondingly. The study of transmission spectra of Au-Co nanowires reveals the control capability of spin transport regime by changing of bias voltage between bulk electrodes.

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Ballistic magnetoresistance over 3000% in Ni nanocontacts at room temperature

Cited by 167 publications

References 13 publications

Magnetoresistance of the ferromagnetic nanocontacts fabricated by electrodeposition

Magnetoresistance of the ferromagnetic nanocontacts fabricated by electrodeposition

Electron Transport in Magnetic Quantum Point Contacts

Spin-filter state of Au-Co nanowires

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