Temperature dependence of magnetization-induced second harmonic generation at buried exchange-biased interfaces

Valev, Ventsislav K.; Gruyters, M.; Kirilyuk, Andrei; Rasing, T.H.M.

doi:10.1103/physrevb.73.233101

Cited by 4 publications

(1 citation statement)

References 21 publications

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“…Therefore, in the antiferromagnetic layer it cannot exclude the existence of the spin glass state, which may exhibit a high m AF and stores energy to stabilize magnetic states, even m AF misaligned with êAF [46]. In CoO/Cu/Fe multilayers, below T B pinned uncompensated spins exist, even for a Cu thickness of 3.5 nm, irrespective of the exchange bias [64], and in TbFebased exchange bias systems, such pinning is responsible ) for an antiferromagnetic layer with selected combinations of anisotropy constant (K AF ), easy-axis direction with respect to the cooling-field direction (θ), exchange constant (J AF ), and layer thickness (t AF ), where the error bars are determined by randomly selected 30 sets of initial configurations in the simulation. In the reference antiferromagnetic layer in (a), (b), K AF = 3 × 10 7 erg cm −3 , θ = 0 • , J AF = 2 × 10 −6 erg cm −1 , and t AF = 4 monolayers (ML) were set, and the other curves are labeled by the parameter adopted differing from the reference.…”

Section: Discussionmentioning

confidence: 99%

Temperature dependence of dipole-induced exchange bias

Lü

Hu²

2020

Nanotechnology

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A modified Monte Carlo method is used to study the dependence of exchange bias, induced by long-range ferromagnet/antiferromagnet interfacial dipolar interactions, on temperature after field cooling. Since sufficient nonzero surplus magnetization in the antiferromagnetic layer is preserved, a positive exchange bias field is yielded. Significantly, this exchange field increases with decreasing temperature and may level off at low temperatures. Then, the antiferromagnetic anisotropy constant, easy-axis direction with respect to the cooling-field direction, antiferromagnetic exchange constant, and antiferromagnetic layer thickness were modulated to study their roles in establishing the low-temperature plateau-like exchange bias field. A thick enough antiferromagnetic layer with the easy-axis direction aligning with the cooling field maximizes the plateau height with a large antiferromagnetic anisotropy constant, while a small antiferromagnetic exchange constant greatly widens the plateau, even from the exchange bias blocking temperature to the lowest temperature. On explicitly calculating the surplus magnetization values in the antiferromagnetic layer meanwhile the dipolar and Zeeman energies in the antiferromagnetic layer, it is found that the ferromagnet/antiferromagnet interfacial dipolar interactions are predominant at the descending branch of the loop to suppress the coercive field with decreasing temperature; in contrast, the magnetic field takes over the lead at the ascending branch and monotonically enhances the coercive field, at the same pace as the decrease in the coercive field at the descending branch. As a consequence, the loop retains a constant shift and becomes wider with decreasing temperature. The long-range noncontact exchange bias that is insensitive to temperature may be used to develop thermal-agitation-resistant spintronic devices with unidirectional anisotropy.

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Section: Discussionmentioning

confidence: 99%

Temperature dependence of dipole-induced exchange bias

Lü

Hu²

2020

Nanotechnology

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Magnetization‐induced Second Harmonic Generation

Kirilyuk

Rasing

2007

Handbook of Magnetism and Advanced Magnetic Materials

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The magnetization‐induced effects in the nonlinear optical response of magnetic media—magnetization‐induced second‐harmonic Generation (MSHG)—lead to very strong and novel nonlinear magneto‐optical (MO) phenomena that appear to be very sensitive to magnetic interface properties. This surface/interface sensitivity of MSHG in combination with the very large MO effects has led to a fast development of this technique over the past decade. On the one hand, an extreme sensitivity of MSHG to the electronic and magnetic structure of clean surfaces has been successfully demonstrated. On the other hand, the penetration depth of light allows one to use this sensitivity to study buried interfaces in multilayer systems. Further experimental developments of the MSHG technique, like space‐ and time resolution as well as magnetization sensitive sum frequency generation, appear to be promising as well.

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Interfacial magnetization in exchange-coupledFe∕Cr∕Festructures investigated by second harmonic generation

et al. 2007

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We have studied the magnetic field dependences of magnetic optical second harmonic generation ͑SHG͒ in MBE-grown Fe/ Cr/ Fe/ Ag/ GaAs͑100͒ heterostructures displaying both bilinear and biquadratic interlayer exchange coupling. The magnetic field H was applied in the ͑100͒ surface plane along both easy ͓͑001͔͒ and hard ͓͑110͔͒ axes of the in-plane fourfold magnetic anisotropy. The SHG has been measured in reflection at near normal incidence for different polarization combinations ͑pp , ps , ss , sp͒ of the fundamental and second harmonic light in longitudinal and transversal geometries. The magnetic field variation of the SHG signal clearly reflects the field-induced transformations of the magnetic state at the interfaces in the trilayer. It strongly depends on the configuration of light polarization, experimental geometry ͑longitudinal or transversal͒, and orientation of the magnetic field H relative to the crystal axes. In contrast to linear magneto-optical Kerr effect, which is odd in magnetic field, magnetic SHG is either even in H or does not display a definite parity at all, depending on the polarization configuration. We interpret the data based on a model accounting for nonmagnetic and magnetic contributions to SHG from the surface and interfaces described by C 4v point symmetry. Taking into account the changes of the mutual orientation of interfacial magnetizations allows us to describe the general features of the measured field dependences of SHG.

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Temperature dependence of magnetization-induced second harmonic generation at buried exchange-biased interfaces

Cited by 4 publications

References 21 publications

Temperature dependence of dipole-induced exchange bias

Temperature dependence of dipole-induced exchange bias

Magnetization‐induced Second Harmonic Generation

Interfacial magnetization in exchange-coupledFe∕Cr∕Festructures investigated by second harmonic generation

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