In-plane anomalies of the exchange bias field in Ni80Fe20/Fe50Mn50 bilayers on Cu(110)

Riedling, S.; Bauer, M.; Mathieu, C.; Hillebrands, B.; Jungblut, R.; Reinders, Angelina H.M.E.

doi:10.1063/1.370174

Cited by 20 publications

(8 citation statements)

References 22 publications

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“…It turns out, that both non-vanishing AF magnetization M AF and a finite angle y between the applied magnetic field and the magnetic easy axes tune the details of the t AF dependencies. We exploit the full capability of the MB approach in analytic expressions and overcome restrictions due to partial solutions accounting either for y [10,11] or t AF [12] alone.…”

Section: Introductionmentioning

confidence: 99%

Exchange bias in a generalized Meiklejohn–Bean approach

Binek¹,

Hochstrat²,

Kleemann³

2001

Journal of Magnetism and Magnetic Materials

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A generalized Meiklejohn-Bean model is considered in order to derive an analytic expression for the dependence of the exchange bias field on the layer thickness involved in ferromagnetic/antiferromagnetic heterosystems, on the orientation of the applied magnetic field with respect to the magnetic easy axes and on the quenched magnetization M AF of the antiferromagnetic pinning layer. While M AF is a well-known feature of field-cooled dilute antiferromagnets, it seems to occur quite generally also in pure AF pinning substrates. The new analytic expressions are successfully compared with recent experimental results and Monte Carlo investigations. r

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Section: Introductionmentioning

confidence: 99%

Exchange bias in a generalized Meiklejohn–Bean approach

Binek¹,

Hochstrat²,

Kleemann³

2001

Journal of Magnetism and Magnetic Materials

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“…Results of recent Kerr measurements of the exchange bias field as a function of the in-plane direction of the external field corroborate this interpretation. 9 The results of the determination of all anisotropies are displayed in Fig. 2 for the uncovered and covered Ni 80 Fe 20 films, respectively.…”

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confidence: 99%

Brillouin light scattering investigations of exchange biased (110)-oriented NiFe/FeMn bilayers

Mathieu

Bauer

Hillebrands

et al. 1998

Journal of Applied Physics

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͓S0021-8979͑98͒01704-6͔The exchange bias effect, which results from exchange coupling between adjacent ferromagnetic ͑F͒ and antiferromagnetic ͑AF͒ layers, which are either deposited in a magnetic field or cooled down in a magnetic field after heating above the Néel temperature, is a well-established phenomenon. 1 It manifests itself in a shift of the hysteresis loop along the axis of the applied field, the so-called exchange bias field, H eb , and it is often described as an inplane unidirectional anisotropy. Although exchange bias systems have been extensively studied, 2-5 the microscopic origin of the exchange bias effect still remains unclear. The most advanced models propose the formation of magnetic domains in the AF layer causing a macroscopic exchange coupling strength of the experimentally observed size, 6,7 which is two orders of magnitude smaller than the atomic F-AF exchange coupling strength. Key issues to be tested experimentally are, ͑i͒ to prove the assumption of large local spatial variations of the F-AF coupling, and ͑ii͒ apart from the detection of the unidirectional anisotropy, to search for possible additional anisotropy contributions of higher order induced by the exchange coupling mechanism.We have chosen to study the ͑110͒-oriented system of Ni 80 Fe 20 /Fe 50 Mn 50 bilayers, since the lowest order in-plane anisotropy contributions, which are of unidirectional, uniaxial, and fourfold symmetry, can be separately determined for simple symmetry reasons. An unexpected large uniaxial anisotropy contribution caused by the FeMn coverage has already been reported for this orientation. 5,6 We have used Brillouin light scattering ͑BLS͒ from dipolar spin waves ͑Damon-Eshbach modes͒ propagating in the F film parallel to the surface to extract the anisotropy constants. 8 Two molecular beam epitaxy ͑MBE͒ grown staircaseshaped samples have been prepared on Cu͑110͒ single crystal substrates. The samples consist of Ni 80 Fe 20 films with thicknesses of 27, 34, 50, and 70 Å for the first, and 18, 24, 37, and 90 Å for the second staircase-shaped sample. Half of each sample was covered by an 80 Å thick Fe 50 Mn 50 layer. At this thickness the exchange bias effect is saturated. 4 Finally, both samples were covered with a 20 and 30 Å thick protective Au layer, respectively. The samples were characterized using low energy electron diffraction, and their chemical cleanliness was checked by Auger electron spectroscopy. An analysis of the process parameters revealed that the residual oxygen content in the gas used for sputter cleaning was significantly larger during preparation of the second sample compared to the first. Evaporation on a slightly contaminated surface can therefore not be excluded for the second sample. During growth a magnetic field of Ϸ250 Oe was applied in the film plane along the ͓110͔ direction to induce exchange biasing. We note that the ͑110͒-oriented Fe 50 Mn 50 surface is an uncompensated plane with a resultant in-plane magnetization along the Ϯ͓001͔ directions. 4 The Brillouin light scatt...

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“…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%

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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In-plane anomalies of the exchange bias field in Ni80Fe20/Fe50Mn50 bilayers on Cu(110)

Cited by 20 publications

References 22 publications

Exchange bias in a generalized Meiklejohn–Bean approach

Exchange bias in a generalized Meiklejohn–Bean approach

Brillouin light scattering investigations of exchange biased (110)-oriented NiFe/FeMn bilayers

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

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