Anisotropy and dynamic properties of Co2MnGe Heusler thin films

Belmeguenai, M.; Zighem, F.; Woltersdorf, Georg; Roussigné, Y.; Chérif, S. M.; Westerholt, K.; Bayreuther, G.

doi:10.1016/j.jmmm.2008.11.042

Cited by 13 publications

(12 citation statements)

References 15 publications

(16 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The exchange constant A we determine ͑22.5 pJ/m͒ is approximately twice as large as the values reported for Co 2 MnGe͑110͒ films grown on Al 2 O 3 by Belmeguenai et al 27,28 In those studies, A was found to vary between 9.8 and 13.8 pJ/m for film thickness ranging from 30 to 83 nm. A discrepancy of this order is not surprising, as the exchange constant was shown to be dependent on the ordering 19 and the number of valence electrons ͑i.e., composition͒.…”

Section: B Bls Spectroscopysupporting

confidence: 62%

“…Using BLS spectroscopy, we find the exchange constant A = 22.5 pJ/ m ͑exchange stiffness D = 413 meV Å 2 ͒, which is twice higher than previously reported for Co 2 MnGe͑110͒ films. 27,28 Even though the composition is highly offstoichiometric, the magnetic moment appears to be approximated by Slater-Pauling behavior. Furthermore, while the magnetization reversal shows a clear uniaxial symmetry, the magneto-optical tensor describing this material is not significantly perturbed with respect to the ideal cubic symmetry.…”

Section: Discussionmentioning

confidence: 99%

“…The compound of interest here, Co 2 MnGe, was recently investigated by BLS spectroscopy. 27,28 However, in that study, Co 2 MnGe͑110͒ films were grown by rf-sputtering onto V-buffered a-plane Al 2 O 3 , and the actual stoichiometry was not verified. We show the exchange constant is nearly doubled for our nonstoichiometric Co 2 Mn x Ge y ͑x , y Ͻ 1͒ thin films compared to that reported for the Co 2 MnGe͑110͒ films.…”

Section: Introductionmentioning

confidence: 89%

“…We show the exchange constant is nearly doubled for our nonstoichiometric Co 2 Mn x Ge y ͑x , y Ͻ 1͒ thin films compared to that reported for the Co 2 MnGe͑110͒ films. 27,28 …”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Magneto-optical investigation of epitaxial nonstoichiometric Co2MnGe thin films

Trudel

Hamrle

Hillebrands

et al. 2010

Journal of Applied Physics

View full text Add to dashboard Cite

We investigate the magneto-optical properties of a nonstoichiometric, epitaxial Co 2 Mn 0.77 Ge 0.42 ͑001͒ film grown on a MgO-buffered MgO͑001͒ single-crystal substrate. Magneto-optical Kerr effect magnetometry indicates that the sample has strong uniaxial anisotropy, whereas the easy and hard axes of magnetization are tilted by ϳ10°with respect to the ͓110͔ and ͓110͔ directions, respectively. A modest quadratic Kerr effect with an amplitude of 0.4 mdeg was observed. Brillouin light scattering spectroscopy was used to find that the exchange constant A, spin-wave stiffness D, and saturation magnetization M s are 22.5 pJ/m, 413 meV Å 2 , and 6.43 B / f.u., respectively. The saturation magnetization value suggests that the Slater-Pauling rule might apply to such nonstoichiometric compositions.

show abstract

Section: B Bls Spectroscopysupporting

confidence: 62%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 89%

“…We show the exchange constant is nearly doubled for our nonstoichiometric Co 2 Mn x Ge y ͑x , y Ͻ 1͒ thin films compared to that reported for the Co 2 MnGe͑110͒ films. 27,28 …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Magneto-optical investigation of epitaxial nonstoichiometric Co2MnGe thin films

Trudel

Hamrle

Hillebrands

et al. 2010

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…The strong angular dependence of the FMR spectra reveals the presence of a uniaxial anisotropy in the films. [7][8][9][10] In conclusion, hydrothermal treatment is appropriate for CZF films to obtain uniform and homogeneous morphology and to tune the ferromagnetic interactions as they are helpful in several technological applications at nano scale. …”

Section: Resultsmentioning

confidence: 99%

Effect of hydrothermal heat treatment on magnetic properties of copper zinc ferrite rf sputtered films

2016

View full text Add to dashboard Cite

The hydrothermal treatment to the nano-structured films can overcome the destruction of the films. The Cu-Zn Ferrite films were fabricated by RF-sputtering on quartz substrates. Subsequently, the as deposited films were heat treated using hydrothermal process. The X-ray diffraction pattern of the as-deposited and hydrothermal treated films indicate nano-crystalline cubic spinel structure. The amorphous nature of the films is removed after hydrothermal treatment with decreased crystallite size. The field emission scanning electron micrographs showed merged columnar growth for as deposited films, which changes to well define columns after hydrothermal heating. The homogeneous cluster distribution is observed in surface view of the hydrothermal treated films. Hydrothermal treated films show merging of in-plane and out of plane magnetization plots (M(H)) whereas the M(H) plots of as deposited films show angular dependence. The strong angular dependence is observed in the FMR spectra due to the presence of a uniaxial anisotropy in the films. The ferromagnetic interactions decrease in hydrothermal heated films due to the reduced shape anisotropy and crystallite size.

show abstract