Nonvolatile Nanopipelining Logic Using Multiferroic Single-Domain Nanomagnets

Yilmaz, Yalcin; Mazumder, Pinaki

doi:10.1109/tvlsi.2012.2205594

Cited by 10 publications

(6 citation statements)

References 11 publications

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“…如图2(a)所示, NML择多逻辑门一般由4个纳磁体组成, I 1 , I 2 , I 3 分别为3个输入端, O为输出端, 其择多功能通过I 1 , I 2 , I 3 对 O的偶极子耦合作用实现. 由于该逻辑门中存在铁磁耦合及反铁磁耦合两种耦合方式, 因而与传统择多逻辑门不同, NML择多逻辑门的逻辑表达式为 [23] O = I 1 • Ī2 + Ī2 • I 3 + I 1 • I 3 .…”

Section: 择多逻辑门是Nmlc的核心相当于Cmosunclassified

A nanomagnets majority logic gate based on heterogeneous multiferroic structure global strain clock

Dou,

Yang,

Xia

et al. 2023

Acta Phys. Sin.

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In the post-Moore era, nanomagnetic logic circuits have shown great potential to replace complementary metal oxide semiconductor (CMOS) circuits. A majority logic gate, as the core of a nanomagnetic logic circuit, is equivalent to the inverter in the CMOS circuit. A nanomagnetic logic majority gate generally has four nanomagnets arranged in a “T” shape. The nanomagnets on the three corners of the “T” (I1, I2, I3) are the three inputs, and the middle nanomagnet is the output (O). This paper proposed a nanomagnet majority logic gate based on the global strain clock of heterogeneous multiferroic, utilizing the response difference of positive and negative magnetostrictive coefficient materials (Ni, Terfenol-D) to the same strain. From bottom to top, the device is mainly composed of a silicon substrate, a piezoelectric layer, and four elliptical cylindrical nanomagnets. The piezoelectric layer's material is PMN-PT, and three input nanomagnets(I1, I2, and I3) are made of Ni, while the output nanomagnet O is made of Terfenol-D. Besides, a two-step calculation mode of “high-stress start - low-stress calculation” was designed, that is, the O was first switched to the “Null” with a stress of -30Mpa, and then the stress was reduced to -15Mpa, so that the O could realize majority calculation under the coupling of I1, I2, and I3. The micromagnetic simulation software Mumax3 was adopted to simulate the performance of the device. The results revealed that the device could successfully perform continuous majority calculation on any three-terminal input combination. By using the two-step calculation mode, the calculation accuracy of the device could reach 100%, its cycle of continuous calculation was 2.75 ns, and the cycle energy consumption was about 64aJ. It was found that the change in energy potential well caused by the change of stress anisotropy energy and dipole coupling energy was the main reason to determine the magnetization dynamic behavior of the device. Therefore, the results of this paper can provide important guidance for the design of nanomagnetic logic circuits.

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Section: 择多逻辑门是Nmlc的核心相当于Cmosunclassified

A nanomagnets majority logic gate based on heterogeneous multiferroic structure global strain clock

Dou,

Yang,

Xia

et al. 2023

Acta Phys. Sin.

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“…This method achieves adiabatic magnetization switching, but linear ramping change of strain in the piezoelectric layer is so difficulty. Yilmaz et al designed the strain clocking of majority logic gate that can realize effective nanopipelining, but the local strain clocking period is not less than 9 ns [27]. The global magnetic field clocking scheme proposed in [28] can improve the information transmission speed, but it has the disadvantage that propagating the logic bit is non-pipelined as well as error-prone.…”

Section: Introductionmentioning

confidence: 99%

Proposal of Global Strain Clocking Scheme for Majority Logic Gate

et al. 2020

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A stairs-type global strain clocking mechanism for nanomagnetic majority logic gate based on shape engineering of nanomagnets was designed in this paper. Reasonable size nanomagnets and proper strain clocking scheme ensure the computing architecture pipelined at room temperature. The optimal global strain clocking scheme was obtained by investigating the impact of magnetic layer thickness and width on clocking period and strain magnitude. Encouragingly, for the global strain clocking, information transmission speed of majority logic gate is increased 1-2 times as against the local strain clocking scheme due to decreasing the number of start-ups during information transmission. While the energy dissipated per clock cycle of the global strain clocking scheme consumes 3-4 times less energy than that of local strain clocking scheme. Moreover, global clocking is used to control a nanomagnetic logic device(NMLD), in which case single device consisted of many nanomagnets can be treated as single nanomagnet. However, magnetization switching is error-prone in the presence of thermal noise at room temperature. Therefore, the proper structure parameters of the device are obtained at room temperature, in which case the error probability of the majority logic gate is 0.5% in theoretical simulation. These results provide essential guidance for the design of energyefficient multiferroic nanomagnetic logic devices.INDEX TERMS Energy-efficient, global strain clocking, nanomagnetic logic device (NMLD), shape engineering, spintronics.

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“…Nanomagnetic logic (NML) also called magnetic quantum dot cellular automata is considered to be one of the promising technologies. NML offers different properties such as inherent non-volatility, radiation hardness, low power dissipation, ultra-high density data storage and processing which make them more attractive for various applications [3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Single‐domain nanomagnets interact with magneto‐static field coupling to propagate and process signals [5, 11]. The magnetisation direction of nanomagnets, originating from the shape and crystalline anisotropy, is used as logic states ‘0’ and ‘1’ [2, 6, 10, 12]. The ‘0’ and ‘1’ states are also the energy minimum configurations of nanomagnets [10].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of a perpendicular nanomagnetic cell and design of reversible XOR gates based on perpendicular nanomagnetic cells

Sayedsalehi

Motlagh

2019

IET Circuits, Devices & Systems

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The purpose of this research is to find out a perpendicular nanomagnetic cell with optimum dimensions by using Object Oriented Micromagnetic Framework (OOMMF) simulation. The optimum perpendicular nanomagnetic cell is characterised and the effect of nano-size on the performance of the cell is explored. Nanomagnetic basic gates are implemented by applying the proper arrangement of nanomagnetic cells. The optimum size of nano cell is 50 × 30 × 5 nm. In this survey, all designs are implemented by employing 3-input and 5-input minority gates. The clock signal, which is a uniform magnetic external field, is needed for proper performance of gates. An irreversible 2-input XOR gate is suggested by these gates based on perpendicular nanomagnetic cells. Moreover, the power dissipation is a major concern in digital circuits. It was proved that the heat dissipation will be very low in reversible circuits. Therefore, the reversible XOR gates are suggested by applying the proposed gates in this study. The correctness of operation of the presented gates is verified by using MagCAD tool. According to the simulation results, the proposed 2-input XOR gates in a single layer have significant improvement in terms of gate count, delay and complexity in comparison to the previous design.

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Nonvolatile Nanopipelining Logic Using Multiferroic Single-Domain Nanomagnets

Cited by 10 publications

References 11 publications

A nanomagnets majority logic gate based on heterogeneous multiferroic structure global strain clock

A nanomagnets majority logic gate based on heterogeneous multiferroic structure global strain clock

Proposal of Global Strain Clocking Scheme for Majority Logic Gate

Characterisation of a perpendicular nanomagnetic cell and design of reversible XOR gates based on perpendicular nanomagnetic cells

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