Interaction between propagating spin waves and domain walls on a ferromagnetic nanowire

Kim, June-Seo; Stärk, Martin; Kläui, Mathias; Yoon, J.; You, Chun‐Yeol; López-Dı́az, L.; Martínez, Eduardo

doi:10.1103/physrevb.85.174428

Cited by 69 publications

(70 citation statements)

References 23 publications

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“…However, the contrary was found in literature [13][14][15][16]: magnons push DWs to move along with them. The counteraction force due to linear MT between magnons and DWs could be a possible explanation for this phenomenon.…”

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confidence: 48%

“…The counteraction force due to linear MT between magnons and DWs could be a possible explanation for this phenomenon. Kim et al [16] employed a similar argument to shed light on the observed drag of DW by magnons in micromagnetic simulation. Wang et al [13] included the counteraction force phenomenologically in a 1D model to understand micromagnetic simulation results, and found qualitative agreement between model and simulation.…”

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confidence: 99%

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Magnonic momentum transfer force on domain walls confined in space

Wang¹,

Wang²,

Guo³

2013

EPL

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PACS 75.30.Ds -Spin waves PACS 75.60.Ch -Domain walls and domain structure Abstract -Momentum transfer from incoming magnons to a Bloch domain wall is calculated using one dimensional continuum micromagnetic analysis. Due to the confinement of the wall in space, the dispersion relation of magnons is different from that of a single domain. This mismatch of dispersion relations can result in reflection of magnons upon incidence on the domain wall, whose direct consequence is a transfer of momentum between magnons and the domain wall. The corresponding counteraction force exerted on the wall can be used for the control of domain wall motion through magnonic linear momentum transfer, in analogy with the spin transfer torque induced by magnonic angular momentum transfer.Ever since its first proposal, manipulation of domain wall motion (DWM) using means other than the conventional magnetic field becomes one focus of the current research in nanomagnetism. The stimulus behind such intense investigation to find new ways for control of DWM is obvious, given the potential application of magnetic domain walls (DWs) as logic elements [1] and information storage bits [2]. Hydromagnetic drag [3], spin transfer torque (STT) [4,5] and momentum transfer (MT) force [6] due to the flow of electrons in metallic materials were proposed, and STT driven DWM was already demonstrated experimentally [7,8]. In contrast, using another important elementary excitation, magnons, to affect the motion of DW comes into horizon only recently. Magnon mediated electric current drag in a normal metal/ferromagnetic insulator/normal metal structure was studied by considering the interplay between electrical current and magnon current [9]. Magnonic STT was demonstrated, employing micromagnetic simulation and analytical calculation [10]. The main difference, or advantage, of magnonic STT compared to the conventional electronic STT lies on the fact that it is mediated by the flow of magnons, rather than electrons. Hence, in contrast to conventional STT whose operation requires the use of ferromagnetic metals, magnonic STT can work in ferromagnetic insulators, ame-(a) E-mail: dwwang@nudt.edu.cn (b) E-mail: guogh@mail.csu.edu.cn liorating significantly the Joule heating problem in metals. However, the MT due to the reflection of magnons by a DW is rarely discussed, simply because magnons travel in an infinitely-extended one-dimensional (1D) wall without any reflection [10][11][12]. The only effect of the presence of a DW is a wave-number dependent phase shift. For a 1D DW confined in space, the situation is different. Due to the fact that the magnon excitation spectrum of the DW is different from that of a single domain, magnons incident on the DW get reflected, with a frequency-sensitive coefficient of reflection. As magnons are reflected back, a counteraction force is exerted on the DW and can be used to initiate DWM [13].In the presence of pure magnonic STT, DWs will move opposite to the propagation direction of the incident spin wave (SW) [10]. However,...

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confidence: 99%

Magnonic momentum transfer force on domain walls confined in space

Wang¹,

Wang²,

Guo³

2013

EPL

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“…A combination of a strong MOKE signal and low magnetic damping in an insulating material would not only be of interest for magneto-optic applications. This would also allow one to investigate novel phenomena such as domain-wall motion in a magnetic insulator, which is in contrast to the well-established domain-wall motion in conductors, not driven by electronic spin currents [27] but by spin waves [28,29]. Recent results in the field of spin caloritronics have shown that the spin waves can also be thermally excited by the spin Seebeck effect [30] and are capable of moving magnetic domains [31][32][33][34][35].…”

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confidence: 99%

Enhanced Magneto-optic Kerr Effect and Magnetic Properties ofCeY2Fe5O12
Kehlberger
¹
,
Richter
²
,
Onbaşlı
³

et al. 2015
Phys. Rev. Applied
92
10
41
0
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The magnetic and magneto-optic properties of epitaxial CeY 2 Fe 5 O 12 (Ce∶YIG) and Y 3 Fe 5 O 12 (yttrium iron garnet or YIG) thin films grown by pulsed laser deposition on gadolinium gallium garnet substrates are determined. An enhanced Faraday effect is known to result from Ce substitution into the yttrium iron garnet lattice, and here we characterize the magneto-optic Kerr effect, as well as the magnetic hysteresis and ferromagnetic resonance response that result from the Ce substitution. X-ray diffraction analysis reveals a high crystallographic quality for the Ce∶YIG films. Measurements of the magneto-optic Kerr effect for two different wavelengths demonstrate that the Ce∶YIG exhibits an up-to-tenfold increase in Kerr rotation compared to YIG. The Ce∶YIG has a slightly larger magnetic moment, as well as increased magnetic damping and higher magnetic anisotropy compared to YIG with a dependence on the crystalline orientation. By specific cerium substitution in YIG, our results show that the engineering of a large Kerr effect and tailored magnetic anisotropy becomes possible as required for magneto-optically active spintronic devices.

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“…In terms of DW propagation direction, the pure magnonic STT predicts [15] a DW moving against magnon propagation direction. However, a DW may also propagate along magnon flow direction [17][18][19]. This is very similar to electric-current-driven DW motion: A DW propagates along or against electron flow direction, depending on detailed spin-orbit interactions and DW types [20][21][22].…”

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confidence: 99%

Thermodynamic theory for thermal-gradient-driven domain-wall motion

Wang

2014

Phys. Rev. B

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Spin waves (or magnons) interact with magnetic domain walls (DWs) in a complicated way that a DW can propagate either along or against magnon flow. However, thermally activated magnons always drive a DW to the hotter region of a nanowire of magnetic insulators under a temperature gradient. We theoretically illustrate why it is surely so by showing that DW entropy is always larger than that of a domain as long as material parameters do not depend on spin textures. Equivalently, the total free energy of the wire can be lowered when the DW moves to the hotter region. The larger DW entropy is related to the increase of magnon density of states at low energy originated from the gapless magnon bound states. Manipulation of a magnetic domain wall (DW) in a nanostructure has attracted much attention due to its application prospects in logical operations [1] and data storage [2]. Moving DWs in a controlled manner is an important issue in those applications. Magnetic fields via energy dissipation [3][4][5] and electric current via angular momentum transfer [6][7][8] are well-known control parameters for DW motion. To overcome the Joule heating [7] in current driven magnetization reversal, heat itself has recently been proposed [9] as an efficient control parameter for spin manipulation. A temperature gradient can generate spin current [10][11][12] due to electron and/or magnon flow. This thermoelectric phenomenon of spin current generation is called spin Seebeck effect that has been experimentally observed through the inverse spin Hall effect [10]. The spin Seebeck effect has also been suggested [13,14] as a control parameter for DW manipulation. As spin-1 carriers, magnons can mediate a spin transfer torque (STT) [15] on a magnetic texture like a DW in a similar way as the electrons do. It was predicted [13,14] that a thermal-magnon-driven DW can propagate along a wire at a high speed, and this prediction was confirmed in a recent experiment [16].There is little doubt that magnonic STT can drive a DW to move. In terms of DW propagation direction, the pure magnonic STT predicts [15] a DW moving against magnon propagation direction. However, a DW may also propagate along magnon flow direction [17][18][19]. This is very similar to electric-current-driven DW motion: A DW propagates along or against electron flow direction, depending on detailed spin-orbit interactions and DW types [20][21][22]. It is not clear whether magnon-driven "wrong" DW propagation direction shares a similar physics origin as its electron counterpart. In principle, angular momentum does not dictate DW motion since its governing dynamics, Landau-Lifshitz-Gilbert (LLG) equation, does not conserve the total angular momentum when the spin-lattice and spin-orbital interactions are involved. Nevertheless, all studies [13,14,16] showed that a DW propagates to the hotter part of a wire under a temperature gradient. Although this result is consistent with the STT prediction, magnonic STT cannot be the sole physics behind. It is thus * Corresponding author: phxw...

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Interaction between propagating spin waves and domain walls on a ferromagnetic nanowire

Cited by 69 publications

References 23 publications

Magnonic momentum transfer force on domain walls confined in space

Magnonic momentum transfer force on domain walls confined in space

Enhanced Magneto-optic Kerr Effect and Magnetic Properties ofCeY2Fe5O12
Kehlberger
¹
,
Richter
²
,
Onbaşlı
³

et al. 2015
Phys. Rev. Applied
92
10
41
0
View full text Add to dashboard Cite

Thermodynamic theory for thermal-gradient-driven domain-wall motion

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Interaction between propagating spin waves and domain walls on a ferromagnetic nanowire

Cited by 69 publications

References 23 publications

Magnonic momentum transfer force on domain walls confined in space

Magnonic momentum transfer force on domain walls confined in space

Enhanced Magneto-optic Kerr Effect and Magnetic Properties ofCeY2Fe5O12Kehlberger1, Richter2, Onbaşlı3 et al. 2015Phys. Rev. Applied9210410View full textAdd to dashboardCite

Thermodynamic theory for thermal-gradient-driven domain-wall motion

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Enhanced Magneto-optic Kerr Effect and Magnetic Properties ofCeY2Fe5O12
Kehlberger
¹
,
Richter
²
,
Onbaşlı
³

et al. 2015
Phys. Rev. Applied
92
10
41
0
View full text Add to dashboard Cite