On the excitation of coherent magnon states

Zagury, N.; Rezende, S. M.

doi:10.1016/0375-9601(69)91127-x

Cited by 15 publications

(8 citation statements)

References 4 publications

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“…Coherent states were first used by Glauber [4] to study the radiation field and some years after, Zagury and Rezende applied the same formalism for the precession magnetization in FMR experiments [5,6]. The main purpose of coherent states is the description of coherent phases of matter, which are represented by macroscopic quantum wave function.…”

Section: Dissipative Coherent Statesmentioning

confidence: 99%

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On the dissipative coherent states of magnons

Mesquita¹,

Moura²

2020

J. Phys.: Condens. Matter

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Research in spintronics has attracted much attention in the last few years due to the technological progress in generating and manipulating spin currents in miniaturized devices. Notwithstanding dissipative effects are inherent to experiments, in many theoretical works the damping of spin waves is included later by phenomenological arguments or even disregarded. Among the many techniques that have been used to treat magnetic models, bosonic representations is one of them. In this work, we chose the Holstein-Primakoff bosonic formalism to treat a ferromagnetic model with a priori inclusion of the damping term. Damping is included through a non-Hermitian term in the Hamiltonian and we showed that the well-known coherent state formalism can be generalized to properly represent the dissipative magnon model. The obtained results are then used to describe the precession magnetization in spintronic experiments, as the spin pumping process.

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Section: Dissipative Coherent Statesmentioning

confidence: 99%

“…contribution in addition to the Heisenberg interaction. We showed that coherent states of magnons [5][6][7] can be generalized to describe the precession magnetization when dissipation is included a priori instead of adding the damping in the final result.…”

Section: Introductionmentioning

confidence: 99%

On the dissipative coherent states of magnons

Mesquita¹,

Moura²

2020

J. Phys.: Condens. Matter

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“…Ambos tiveram suas carreiras influenciadas pelo curso de introduçãoàótica quântica. No ano seguinte ao curso eles publicaram dois artigos onde aplicavam a teoria quântica da coerência, que havia sido apresentada por Nussenzveig, para descrever os estados de mágnons [31,32]. Mágnons são os quanta das ondas de spin.…”

Section: Influências E Alunosunclassified

Herch Moysés Nussenzveig e a ótica quântica: consolidando disciplinas através de escolas de verão e livros-texto

Neto

Freire

2013

Rev. Bras. Ensino Fís.

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A ótica passou por uma profunda reconfiguração devido à invenção do laser e a outros desenvolvimentos técnicos e teóricos que ocorreram ao longo da década de 1960, com uma descontinuidade no campo e a consequente criação de uma nova disciplina, a ótica quântica. Nesse artigo discutiremos o papel de escolas de verão e livros-texto na consolidação da ótica quântica através de um estudo de caso focando em dois cursos ministrados pelo fsico Herch Moysés Nussenzveig que deram origem a dois dos primeiros livros de ótica quântica. Os cursos foram ministrados na Pontifcia Universidade Católica do Rio de Janeiro, em 1968, e na Escola Latino-Americana de Fsica, em 1970. Aqueles foram os primeiros cursos de ótica quântica na América Latina. Veremos como Nussenzveig, seus livros e cursos ajudaram a consolidar e espalhar a ótica quântica pelas Américas.

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“…In this case, the entire spin field shows synchronous dynamics and can be represented by using a single spin that is well pictured by a classical vector. A quantum state like that is formally described by a coherent state, which was initially used to derive a fully quantum model of the radiation fields [33,34] as well as the coherent behavior of magnons [35][36][37]. It is well-known that coherent states represent the more classical-quantum state, i.e., states with minimum uncertainty [38].…”

Section: Introductionmentioning

confidence: 99%

Theoretical analysis of FMR-driven spin pumping current and its properties via Self-Consistent Harmonic Approximation

Moura¹

2022

Preprint

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We applied the Self-Consistent Harmonic Approximation (SCHA), combined with coherent states formalism, to study the ferromagnetic resonance (FMR) in a ferromagentic/normal metal junction. Due to the interface interaction, the FMR-generated spin current is injected from the magnetic insulator to the normal metal, the so-called spin pumping. Ordinarily, ferromagnetic models are described by bosonic representation or phenomenological theories; however, in a coherent magnetization state, the SCHA is the more natural choice to treat FMR problems. Over the years, the SCHA has successfully applied to investigate ferro and antiferromagnetism in a wide range of scenarios. The main point of the SCHA formalism involves the adoption of a quadratic model for which corrections are included through temperature-dependent renormalization parameters. Therefore, the SCHA is an efficient method for determining the properties of magnetically ordered phases. Using the SCHA, we obtained the temperature dependence of FMR-driven spin pumping. In addition, we found the spin-mix conductance, the additional damping from the angular momentum injection into the normal metal side, and the magnetic susceptibility. The SCHA outcomes are in remarkable agreement with the results of the literature.

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On the excitation of coherent magnon states

Cited by 15 publications

References 4 publications

On the dissipative coherent states of magnons

On the dissipative coherent states of magnons

Herch Moysés Nussenzveig e a ótica quântica: consolidando disciplinas através de escolas de verão e livros-texto

Theoretical analysis of FMR-driven spin pumping current and its properties via Self-Consistent Harmonic Approximation

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