Brillouin light scattering study of magnetic coupling in CoFe/Mn/CoFe

Chirita, M.; Robins, G A; Stamps, R. L.; Sooryakumar, R.; Filipkowski, M. E.; Gutiérrez, Carlos; Prinz, G. A.

doi:10.1103/physrevb.58.869

Cited by 17 publications

(7 citation statements)

References 10 publications

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“…The magnetic proximity model (5), on the contrary, predicts a monotonic increase in the frequency of the optical mode with the field without any special features. 29 Studies of the magnetic excitation spectra in the structures Fe/Cr/Fe, including also of very high quality, 34 always showed the presence in the optical oscillation mode of the pronounced downward part with a minimum in the saturation field (significant deviations from the model of the biquadratic exchange were found in Refs. 36-38 and are discussed below).…”

Section: A Case Historymentioning

confidence: 94%

“…The model has been successfully used to describe a magnetic structure of the system with an antiferromagnetic spacer of manganese, 29,30 but the question of the applicability of the model to the system Fe/Cr/Fe remained unclear. A series of works was devoted by the group of H. Zabel to an experimental study of the magnetic phase diagram of thin chromium layers and its impact on the effect of the interlayer exchange in superlattices Fe/Cr (see Refs.…”

Section: A Case Historymentioning

confidence: 99%

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The interlayer exchange interaction in multilayer magnetic systems Fe/Cr/Fe (Review Article)

Крейнес

Kholin

Demokritov

2012

Low Temperature Physics

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Upsurge of interest in the study of magnetic multilayer structures began in the mid-80s of the twentieth century and was caused by significant progress in the technology of ultrathin metallic films. For a few years, phenomena extremely interesting from both fundamental and applied point of view have been found in these structures: the antiparallel arrangement of the ferromagnetic layers, giant magnetoresistance, alternating oscillations of the interlayer exchange, noncollinear interlayer ordering of magnetic moments. All this and the closeness of technologies, used for the sample preparation to those traditionally applied in microelectronics, promised great potentials for developing compact magnetic field sensors, non-volatile memory for electronic devices, etc. To date, some of these features are already implemented in the mass commercial products (e.g., read heads of hard drives), and others still wait in the wings. The Nobel Prize, awarded in 2007 to A. Fert and P. Grünberg with the words “For the discovery of the giant magnetoresistance effect” can be considered as recognition of the importance of the discoveries made in this area. A special place in these works was given to the Fe/Cr/Fe system. It is there for the first time almost all of the most interesting phenomena were observed that caused a boom in the physics of magnetic films. However, until recently the nature of the exchange interaction in this system aroused great debates. First of all, it was due to a complex phase diagram of chromium spacer and strong influence on the sample properties of technological perfection of its structure. Here we made a brief review of the main experimental and theoretical studies on the multilayer systems Fe/Cr/Fe, as well as recounted the results of our own studies (performed with a group of co-authors), which greatly clarify the mechanism of the interlayer interaction in this system.

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Section: A Case Historymentioning

confidence: 94%

Section: A Case Historymentioning

confidence: 99%

The interlayer exchange interaction in multilayer magnetic systems Fe/Cr/Fe (Review Article)

Крейнес

Kholin

Demokritov

2012

Low Temperature Physics

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“…3 It is well established that magnetic properties in the multilayer film are closely related to the magnetic surface and interface states; [4][5][6] however, our understanding of the fundamental dynamical magnetic excitations-which is intimately connected with the exchange interaction between different layers-is still far from complete. Magnetization dynamics in films can be carried out by various experimental techniques, such as the ultrafast magneto-optical Kerr effect, [7][8][9] Brillouin light scattering, 10 and ferromagnetic resonance ͑FMR͒. 11,12 In this paper, we used the FMR technique to investigate exchange-dominated surface and bulk spin-wave modes in a single period of CoFe/ PtMn/ CoFe trilayer film.…”

Section: Polycrystallinementioning

confidence: 99%

Ferromagnetic resonance studies of surface and bulk spin-wave modes in a CoFe∕PtMn∕CoFe multilayer film

Wu¹,

Khalfan²,

Pettiford³

et al. 2008

Journal of Applied Physics

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We studied exchange-dominated surface and bulk spin-wave modes in a single period of CoFe/ PtMn/ CoFe trilayer film grown on a seed layer of Ru with CoFe film compositions being Co-16 at. % Fe. The thickness of the ferromagnetic CoFe layers is ϳ400 Å and that of the antiferromagnetic layer is 120 Å. Multimode spin-wave spectra were observed using the ferromagnetic resonance technique, as the sample plane was rotated with respect to the direction of the magnetic field. The effective magnetic anisotropy parameters and the g factor of the magnetic film were calculated from the field corresponding to the main ͑strongest͒ resonance peak at different angles. In addition, we identified a high-order standing spin wave in our spectra and found a "critical angle" in the multilayer sample. As H is significantly rotated away from the normal, there is a critical orientation where only a single acoustic spin-wave mode can be observed. We included an effective surface anisotropy field to describe our results. From the surface anisotropy, we are able to analyze the spin-wave resonance spectra in terms of the dynamic surface spin pinning. This allows us to determine the exchange interaction stiffness in the CoFe layers, J ϳ 2.7 meV.

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“…Some features are strongly dependent on particular functional forms used to represent the coupling and can be used to distinguish between different models. 5 In this section examples for two types of linear excitations, spin waves and domain wall resonances, are discussed as probes of interlayer exchange coupling between two exchange coupled ferromagnets. The case of interlayer exchange between a ferromagnet and antiferromagnet is discussed in the next section.…”

Section: Exchange Coupling I: Spin Waves and Domain Wallsmentioning

confidence: 99%

High frequency spin dynamics in magnetic heterostructures (invited)

Stamps

2001

Journal of Applied Physics

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Influence of interlayer dipolar coupling on magnetization reversal and high-frequency dynamics in asymmetric NiFe/Cu/NiFe circular nanorings J. Appl. Phys.High frequency permeability of patterned spin valve type thin films Fast reversal processes in magnetic particles and arrays involve fundamental magnetic dynamic and relaxation processes. Exchange and dipolar interactions determine equilibrium ground states and strongly influence linear and nonlinear dynamics. Calculations are used to show how high frequency resonances in arrays of densely packed magnetic particles can affect reversal times, possibly leading to dramatic decreases in switching rates. High frequency excitations and dynamic processes in interface exchange coupled magnets are also discussed, with emphasis on exchange biased materials. The exchange bias effect is closely related to interface magnetic structure and magnetization processes in systems of ferromagnets exchange coupled to antiferromagnets. It is shown how magnetization processes in the antiferromagnet can be studied through observation of dynamic effects in the ferromagnetic component.

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Brillouin light scattering study of magnetic coupling in CoFe/Mn/CoFe

Cited by 17 publications

References 10 publications

The interlayer exchange interaction in multilayer magnetic systems Fe/Cr/Fe (Review Article)

The interlayer exchange interaction in multilayer magnetic systems Fe/Cr/Fe (Review Article)

Ferromagnetic resonance studies of surface and bulk spin-wave modes in a CoFe∕PtMn∕CoFe multilayer film

High frequency spin dynamics in magnetic heterostructures (invited)

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