Giant Magnetoresistance in Boundary-Driven Spin Chains

Poulsen, Kasper; Zinner, N. T.

doi:10.1103/physrevlett.126.077203

Cited by 13 publications

(4 citation statements)

References 35 publications

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“…Magnetic materials exhibit many new physical phenomena, such as magnetostriction (MS), [1] magnetocaloric effect (MCE), [2] giant magnetoresistance (GMR), [3] and giant magneto-impedance (GMI), which have rarely been studied. [4] Soft magnetic materials have been widely used due to their high saturation magnetization, low coercivity, and high permeability.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric magnetoimpedance effect and dipolar interactions of FINEMET/SiO₂/FePd composite ribbons

Guo

Wang

et al. 2023

Chinese Phys. B

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The dipolar interactions were investigated through the asymmetric magnetoimpedance in FINEMET/SiO2/FePd composite ribbons. The interface between the hard (FePd layer) and soft (FINEMET ribbon) phases was coherent by SiO2 layer in FINEMET/SiO2/FePd composite ribbons, which effectively induced dipolar interactions. The contribution of dipolar interactions to the bias field (H b ) by asymmetrical giant magnetoimpedance and magnetic properties was analyzed. The results show that H b response decreases with the increase of the SiO2 layer thickness. It indicated that the linear region near-zero field can be tuned by the thickness of SiO2 layer. These results allowed the GMI ratio (58 %) and characteristic frequency (500 kHz) were optimized. The transverse and longitudinal magnetic domain structure of FINEMET ribbon and FePd film were confirmed, respectively. The composite ribbons with high GMI ratio and low frequency can apply in linear magnetic sensors.

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Section: Introductionmentioning

confidence: 99%

Asymmetric magnetoimpedance effect and dipolar interactions of FINEMET/SiO₂/FePd composite ribbons

Guo

Wang

et al. 2023

Chinese Phys. B

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“…In the present work, we are interested in the giant magnetoresistance (GMR) effect [ 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 51 ], which was undoubtedly one of the groundbreaking works in the late 80s. The Nobel winning work [ 6 , 9 , 23 , 26 , 29 ] in the year 2007 by Albert Fert and Peter Grünberg has enriched the area of spintronics along with immense technological progress such as magnetic recording, storage and sensor industries, and many more [ 52 , 53 , 54 , 55 ].…”

Section: Introductionmentioning

confidence: 99%

Possible Routes to Obtain Enhanced Magnetoresistance in a Driven Quantum Heterostructure with a Quasi-Periodic Spacer

et al. 2021

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In this work, we perform a numerical study of magnetoresistance in a one-dimensional quantum heterostructure, where the change in electrical resistance is measured between parallel and antiparallel configurations of magnetic layers. This layered structure also incorporates a non-magnetic spacer, subjected to quasi-periodic potentials, which is centrally clamped between two ferromagnetic layers. The efficiency of the magnetoresistance is further tuned by injecting unpolarized light on top of the two sided magnetic layers. Modulating the characteristic properties of different layers, the value of magnetoresistance can be enhanced significantly. The site energies of the spacer is modified through the well-known Aubry–André and Harper (AAH) potential, and the hopping parameter of magnetic layers is renormalized due to light irradiation. We describe the Hamiltonian of the layered structure within a tight-binding (TB) framework and investigate the transport properties through this nanojunction following Green’s function formalism. The Floquet–Bloch (FB) anstaz within the minimal coupling scheme is introduced to incorporate the effect of light irradiation in TB Hamiltonian. Several interesting features of magnetotransport properties are represented considering the interplay between cosine modulated site energies of the central region and the hopping integral of the magnetic regions that are subjected to light irradiation. Finally, the effect of temperature on magnetoresistance is also investigated to make the model more realistic and suitable for device designing. Our analysis is purely a numerical one, and it leads to some fundamental prescriptions of obtaining enhanced magnetoresistance in multilayered systems.

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“…A particularly useful device for controlling heat is the heat rectifier: a device that exhibits asymmetric transport of heat similar to the diode in electronics. Within the framework of boundary driven quantum systems, a quantum system is coupled to two heat baths at the extremities [11][12][13]. The diode properties of the quantum system can then be studied by calculating the heat transport for both configurations of the baths.…”

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confidence: 99%

Dark State Induced Heat Rectification

Poulsen,

Zinner

2022

Preprint

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Heat and noise control is essential for the continued development of quantum technologies. For this purpose, a particular powerful tool is the heat rectifier, which allows for heat transport in one configuration of two baths but not the reverse. Here we propose a class of rectifiers that exploits the unidirectionality of a low temperature bath to force the system into a dark state thus blocking heat transport in one configuration of the two baths. However, if the two baths are switched around, a heat current is observed. An implementation using a qutrit coupled to two harmonic oscillators is proposed and rectification values beyond 10 3 is achieved for realistic parameter values. Furthermore, we show that the heat current can be amplified by an order of magnitude through external driving without diminishing the diode functionality. The heat rectification effect is seen for a large range of parameters, and it is robust towards both decay and dephasing.

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Giant Magnetoresistance in Boundary-Driven Spin Chains

Cited by 13 publications

References 35 publications

Asymmetric magnetoimpedance effect and dipolar interactions of FINEMET/SiO₂/FePd composite ribbons

Asymmetric magnetoimpedance effect and dipolar interactions of FINEMET/SiO₂/FePd composite ribbons

Possible Routes to Obtain Enhanced Magnetoresistance in a Driven Quantum Heterostructure with a Quasi-Periodic Spacer

Dark State Induced Heat Rectification

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Giant Magnetoresistance in Boundary-Driven Spin Chains

Cited by 13 publications

References 35 publications

Asymmetric magnetoimpedance effect and dipolar interactions of FINEMET/SiO2/FePd composite ribbons

Asymmetric magnetoimpedance effect and dipolar interactions of FINEMET/SiO2/FePd composite ribbons

Possible Routes to Obtain Enhanced Magnetoresistance in a Driven Quantum Heterostructure with a Quasi-Periodic Spacer

Dark State Induced Heat Rectification

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Product

Resources

About

Asymmetric magnetoimpedance effect and dipolar interactions of FINEMET/SiO₂/FePd composite ribbons

Asymmetric magnetoimpedance effect and dipolar interactions of FINEMET/SiO₂/FePd composite ribbons