Temperature tunable oscillator of THz-frequency signals based on the orthoferrite/heavy metal heterostructure

Meshcheryakov, Aleksei; Сафин, А. Р.; Kalyabin, D. V.; Никитов, С. А.; Mednikov, A. M.; Frolov, D A; Kirilyuk, Andrei

doi:10.1088/1361-6463/abe441

Cited by 6 publications

(3 citation statements)

References 28 publications

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“…For the determination of sensitivity in the case of a biaxial AFM one needs to use the general expressions (22) and (23). The analysis presented above for the uniaxial nondegenerate case is applicable to the biaxial case as well.…”

Section: Parametermentioning

confidence: 99%

“…The AFM internal exchange magnetic field, which keeps the AFM sublattices anti-parallel to each other, reaches hundreds of Tesla, while the AFM anisotropy field is much smaller (from µT to several T), and, therefore, the tuning of the AFMR frequency is, usually, done by changing the AFM anisotropy fields. The variation of the anisotropy fields can be done using magnetostriction in the adjacent piezoelectric layer [20,21], driving DC current through the adjacent HM layer [13], or by changing temperature [22]. When an external bias magnetic field is applied to a uniaxial AFM, its influence on the AFMR frequency depends on the field direction relative to the anisotropy easy axis, and linear tuning of the AFMR frequency is possible when the bias field is parallel to the anisotropy easy axis, but the bias field magnitude necessary for the AFMR tuning is rather large, of the order of several tesla.…”

Section: Introductionmentioning

confidence: 99%

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Theory of Antiferromagnet-Based Detector of Terahertz Frequency Signals

et al. 2022

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We present a theory of a detector of terahertz-frequency signals based on an antiferromagnetic (AFM) crystal. The conversion of a THz-frequency electromagnetic signal into the DC voltage is realized using the inverse spin Hall effect in an antiferromagnet/heavy metal bilayer. An additional bias DC magnetic field can be used to tune the antiferromagnetic resonance frequency. We show that if a uniaxial AFM is used, the detection of linearly polarized signals is possible only for a non-zero DC magnetic field, while circularly polarized signals can be detected in a zero DC magnetic field. In contrast, a detector based on a biaxial AFM can be used without a bias DC magnetic field for the rectification of both linearly and circularly polarized signals. The sensitivity of a proposed AFM detector can be increased by increasing the magnitude of the bias magnetic field, or by by decreasing the thickness of the AFM layer. We believe that the presented results will be useful for the practical development of tunable, sensitive and portable spintronic detectors of THz-frequency signals based of the antiferromagnetic resonance (AFMR).

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Section: Parametermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Theory of Antiferromagnet-Based Detector of Terahertz Frequency Signals

et al. 2022

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“…В [7] двухслойная структура, состоящая из АФМ и слоя тяжелого металла (ТМ), использовалась для детектирования терагерцевого спинового тока, а в [8,9] был предложен механизм перестройки частоты детектора THz-колебаний на основе АФМ с помощью постоянного электрического тока. Легким способом перестройки частоты такого детектора является изменение анизотропии АФМ с помощью магнитострикции [10] или температуры [11]. Целью настоящей работы является теоретическое исследование детектора THz-колебаний, построенного на основе проводящего АФМ Mn 2 Au с нарушенной пространственной инверсией типа " легкая плоскость", активно используемого в экспериментах по спинтронике [12,13].…”

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Детектирование Терагерцевых Электромагнитных Волн С Помощью Проводящих Антиферромагнетиков

Сафин¹,

Козлова²,

Калябин³

et al. 2021

Письма В Журнал Технической Физики

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We investigate a mathematical model of a terahertz electromagnetic wave detector based on a conducting antiferromagnet and a heavy metal. The mechanism of resonant straightening of oscillations is based on the inverse spin Hall effect in a heavy metal under spin pumping from an antiferromagnet. It is shown that the frequency dependence of the constant voltage of the detector has a resonant character with a peak corresponding to the frequency of antiferromagnetic resonance. The sensitivity to an alternating terahertz signal of the proposed detector structure is comparable to the sensitivity of modern detectors based on Schottky and Gunn diodes.

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Chirality-selective easily adjustable spin current from uniaxial antiferromagnets

Ouyang

Wang

2021

Applied Physics Letters

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Spin current generation and injection in antiferromagnetic heterostructures opens up new perspectives in the fields of nanoelectronics, spintronics, and quantum computation. Here, we theoretically investigate terahertz spin current in an antiferromagnet (AFM)/normal metal (NM) heterostructure generated by spin pumping. Under the framework of linear response theory, we compute the alternating spin current (ac spin current) inside the NM of the heterostructure arising from the spin pumping of a resonant terahertz magnetic field inside the AFM. An external direct current (dc) magnetic field is also applied to tune the resonance frequency of the AFM, allowing the resonance between terahertz field and AFM to be achieved more easily. In both uniaxial antiferromagnets MnF2 and Cr2O3, we find that once the driving THz field is resonant and circular polarized according to the resonance mode of the AFM, the amplitude of ac spin current is independent of the external magnetic field. On the other hand, in the biaxial antiferromagnet NiO under the same pumping conditions, such a phenomenon is not observed, which can be ascribed to the complicated nondegenerate elliptical chiral mode in biaxial AFMs. More interestingly, for both types of AFMs, we find that the ac component of the spin current increases linearly with the applied terahertz magnetic field distinct from the dc component that increases quadratically. The aforementioned features in uniaxial AFMs provide an easily tunable guideline to optimize the generation of high-frequency spin current by a given terahertz pumping source.

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Temperature tunable oscillator of THz-frequency signals based on the orthoferrite/heavy metal heterostructure

Cited by 6 publications

References 28 publications

Theory of Antiferromagnet-Based Detector of Terahertz Frequency Signals

Theory of Antiferromagnet-Based Detector of Terahertz Frequency Signals

Детектирование Терагерцевых Электромагнитных Волн С Помощью Проводящих Антиферромагнетиков

Chirality-selective easily adjustable spin current from uniaxial antiferromagnets

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