Strong anisotropies in MBE-grown Co/Cr(001): Ferromagnetic-resonance and magneto-optical Kerr-effect studies

Schreiber, Frank; Zeidler, Thomas; Metoki, Naoto; Donner, W.; Zabel, H.; Pelzl, J.

doi:10.1103/physrevb.51.2920

Cited by 30 publications

(14 citation statements)

References 37 publications

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“…The effective magnetization and anisotropy of the sample was determined by fitting the line position as a function of angle to the resonance equation of a flat disk with the external field applied in the plane of the sample. 19 The resonance equation is given by …”

Section: Ferromagnetic Resonancementioning

confidence: 99%

Magnetic properties of Co/Rehcp(101¯0)superlattices

et al. 1999

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hcp(101 0) Co/Re superlattices were grown via magnetron sputtering on Al 2 O 3 (112 0) substrates. The thickness of the Co layers was approximately 1.8 nm with the Re layer thickness varying between 0.5 nm and 3.0 nm. Low angle x-ray reflectivity revealed that for our growth conditions the interfacial roughness is approximately 0.4 nm in each material at each interface. High angle x-ray diffraction, together with offspecular x-ray diffraction, showed that the growth is epitaxial with the ͓0001͔ axis in-plane and parallel to the Al 2 O 3 ͓0001͔ axis. Magnetization measurements indicate the presence of an in-plane uniaxial anisotropy in all samples and antiferromagnetic coupling when the Re layer thicknesses are less than 1.0 nm and close to 2.0 nm. The uniaxial anisotropy was measured via ferromagnetic resonance and determined to be approximately 5 times smaller than in bulk Co for thicker Re layer samples. For thin Re samples, a spin-flop transition causes a competition between the anisotropic magnetoresistance and the giant magnetoresistance when the external field is applied parallel to the easy axis. The most notable consequence is that the magnetoresistance is positive for small fields and negative for large fields when the current is perpendicular to the applied field. We also report a magnetoresistance of ϳ4.5% at 10 K, more than twice the maximum value previously reported for hcp͑0001͒ Co/Re multilayers. Co/Re hcp(101 0) superlattices provide a new system whereby the role of in-plane magnetic anisotropy in the magnetoresistance of metallic superlattices can be studied.

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Section: Ferromagnetic Resonancementioning

confidence: 99%

Magnetic properties of Co/Rehcp(101¯0)superlattices

et al. 1999

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“…This indicates that the crystallographic Co growth domains are much smaller in size than the magnetic domains; i.e., the crystallographic domains can be treated in the limit of strong magnetic coupling. 17 In the opposite case, two lines would be observed. For the case found here, and with a nearly 1:1 proportion of the Co-growth domains, the resulting anisotropy energy is F ani eff ϭ 1 2 F ani eff (⌽)ϩ 1 2 F ani eff (⌽ϩ90°) with contributions from the two growth domains of F ani eff (⌽) and F ani eff (⌽ϩ90°).…”

Section: Fmr Measurementsmentioning

confidence: 99%

“…From this value the difference is estimated to be less than Ϸ2% using the relations given in Ref. 17.…”

Section: Fmr Measurementsmentioning

confidence: 99%

“…If K 2 Ͼ0, the easy axis will then be found between the two c axes. Therefore, neglecting the out-of-plane ⌰ dependence, we can write the anisotropy energy ͑as for the Co case 17 The angular offset of 45°accounts for the rotation of the c axes from the ͓100] axes. Table I shows the results of the anisotropy parameters including the effective magnetization which is defined as…”

Section: Fmr Measurementsmentioning

confidence: 99%

“…The next higher anisotropy contribution in hcp symmetry, K 2 hcp , which is of fourfold symmetry, is observed as the lowest-order contribution. 17 To discuss the Co behavior in more detail we show the resonance spectra of a single Co(1120) layer with a thickness of 6.6 nm ͑see Fig. 3͒.…”

Section: Fmr Measurementsmentioning

confidence: 99%

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Magnetic exchange-coupling effects in asymmetric trilayer structures of MBE-grown Co/Cr/Fe

et al. 1996

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We present results of anisotropy and exchange-coupling studies of asymmetric Co/Cr/Fe trilayers and superlattices grown by molecular beam epitaxy on Cr͑001͒/Mg͑001͒ buffers and substrates. The magnetic properties have been investigated using both the longitudinal magneto-optical Kerr effect and ferromagnetic resonance. The hysteresis data obtained from the trilayer system were fit to a theoretical model which contains both bilinear and biquadratic coupling. The effective in-plane anisotropy was found to be of fourfold symmetry with the same easy-axis orientation for both the Fe and Co layers. An analysis of the easy-axis hysteresis loops indicates long-period oscillatory coupling and also suggests a short periodic coupling. We show that weakly antiferromagnetically coupled asymmetric films might serve as potential candidates for improved spin-valve systems.

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CrCo

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2022

Magnetic Properties of Metals: Magnetic and Electric Properties of Magnetic Metallic Multilayers

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Strong anisotropies in MBE-grown Co/Cr(001): Ferromagnetic-resonance and magneto-optical Kerr-effect studies

Cited by 30 publications

References 37 publications

Magnetic properties of Co/Rehcp(101¯0)superlattices

Magnetic properties of Co/Rehcp(101¯0)superlattices

Magnetic exchange-coupling effects in asymmetric trilayer structures of MBE-grown Co/Cr/Fe

CrCo

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