Anomalous spin-wave damping in exchange-biased films

Rezende, S. M.; Azevedo, A.; Lucena, M. A.; Aguiar, F. M. de

doi:10.1103/physrevb.63.214418

Cited by 106 publications

(108 citation statements)

References 21 publications

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“…7(c), we show that the enhancement of the spin-angular momentum transfer through the interface is indeed due to the interfacial exchange coupling, as α is proportional to the square of the exchange bias. This dependence also suggest that one of the main damping mechanisms in our samples is the two-magnon scattering at the FM/AFM interface, in agreement with the previous studies [19,41,42]. The exact mechanism of the enhancement of h z is of complex origin due to the strong spin-orbit coupling in the system and the interface magnetic coupling.…”

Section: Discussionsupporting

confidence: 91%

Electrical manipulation of ferromagnetic NiFe by antiferromagnetic IrMn

et al. 2015

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We demonstrate that an antiferromagnet can be employed for a highly efficient electrical manipulation of a ferromagnet. In our study, we use an electrical detection technique of the ferromagnetic resonance driven by an in-plane ac current in a NiFe/IrMn bilayer. At room temperature, we observe antidampinglike spin torque acting on the NiFe ferromagnet, generated by an in-plane current driven through the IrMn antiferromagnet. A large enhancement of the torque, characterized by an effective spin-Hall angle exceeding most heavy transition metals, correlates with the presence of the exchange-bias field at the NiFe/IrMn interface. It highlights that, in addition to the strong spin-orbit coupling, the antiferromagnetic order in IrMn governs the observed phenomenon.

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Section: Discussionsupporting

confidence: 91%

Electrical manipulation of ferromagnetic NiFe by antiferromagnetic IrMn

et al. 2015

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“…If the two-magnon is strictly interfacial the scattering strength should scale like the inverse ferromagnetic film thickness squared [9,17]. Furthermore the scattering strength depends only weakly on the microwave frequency [44].…”

Section: Magnetization Relaxationmentioning

confidence: 99%

“…However, magnetization reversal measurements can be difficult to analyze quantitatively, in particular due to the complex phase diagrams [10,11] and the formation of complicated domain structures [12][13][14][15]. Here measurements of the magnetization dynamics, for example using ferromagnetic resonance [8,[16][17][18] or Brillouin Light Scattering [17][18][19], offer the advantage that they can be carried out at external magnetic fields sufficient to saturate the system. While most of the early work on magnetization dynamics of exchange bias systems focused on the determination of the unidirectional anisotropy to provide input to model development, it was also noted early on that the exchange bias effect has a profound influence on the magnetization relaxation in these systems [16,18].…”

Section: Introductionmentioning

confidence: 99%

“…While most of the early work on magnetization dynamics of exchange bias systems focused on the determination of the unidirectional anisotropy to provide input to model development, it was also noted early on that the exchange bias effect has a profound influence on the magnetization relaxation in these systems [16,18]. Two magnon scattering at the ferromagnet/antiferromagnet interface is one of the major contributions to the relaxation in these systems [9,17,20]. However, it was only after the development of broadband ferromagnetic resonance capabilities that a unidirectional contribution to the relaxation in these systems was observed [21].…”

Section: Introductionmentioning

confidence: 99%

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Broadband ferromagnetic resonance characterization of anisotropies and relaxation in exchange-biased IrMn/CoFe bilayers

et al. 2017

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The magnetization dynamics of exchange biased IrMn/CoFe bilayers have been investigated using broadband and in-plane angle dependent ferromagnetic resonance spectroscopy. The interface energy of the exchange bias effect in these bilayers exceeds values previously reported for metallic antiferromagnets. A strong perpendicular magnetic anisotropy and a small in-plane uniaxial anisotropy are also observed in these films. The magnetization relaxation of the bilayers has a strong unidirectional contribution, which is in part caused by two-magnon scattering. However, a detailed analysis of in-plane angle and thickness dependent linewidth data strongly suggests the presence of a previously undescribed unidirectional relaxation mechanism.2

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“…[32][33][34][35][36][37][38][39] As such a process cannot conserve momentum, it requires the presence of defects that serve as scatterers in order to conserve the total momentum. To describe the two-magnon contribution to the FMR linewidth in our films, we use the Arias-Mills formulation, [32][33][34][35][36][37][38][39] in which the angular dependence of the linewidth H 2M is obtained by introducing a scattering matrix of extrinsic nature into the spin-wave Hamiltonian, leading to…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Critical thickness investigation of magnetic properties in exchange-coupled bilayers

et al. 2011

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We present a systematic investigation of the magnetic properties of two series of polycrystalline ferromagneticantiferromagnetic bilayers (FM-AF) of Ni 81 Fe 19 (10nm)/Ir 20 Mn 80 (t AF ) grown by dc magnetron sputtering. One series was grown at an oblique angle of 50• and the other one was grown at 0• . Ferromagnetic resonance (FMR) was used to measure the exchange bias field H E , the rotatable anisotropy field H RA , and the FMR linewidth H as a function of the antiferromagnetic layer thickness t AF . Three relaxation channels due to isotropic Gilbert damping, anisotropic two-magnon scattering, and mosaicity effects are simultaneously distinguished through the angular dependence of the FMR linewidth. In the regime of small IrMn layer thicknesses, not enough to establish the exchange bias anisotropy, the FMR linewidth shows a sharp peak due to the contribution of the two-magnon scattering mechanism. The results presented here are of general importance for understanding the dynamics of magnetization in the FM-AF structures.

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Anomalous spin-wave damping in exchange-biased films

Cited by 106 publications

References 21 publications

Electrical manipulation of ferromagnetic NiFe by antiferromagnetic IrMn

Electrical manipulation of ferromagnetic NiFe by antiferromagnetic IrMn

Broadband ferromagnetic resonance characterization of anisotropies and relaxation in exchange-biased IrMn/CoFe bilayers

Critical thickness investigation of magnetic properties in exchange-coupled bilayers

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