Multistep magnetic switching in single-crystal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn /><mml:mo>(</mml:mo><mml:mn>001</mml:mn><mml:mo>)</mml:mo><mml:mn /><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Co</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant="normal">MnGe</mml:mi></mml:math>films

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.

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“…34 This is not the case here, as can be seen in Fig. 3 where magnetization reversal is seen to occur in a single step for every orientation.…”

Section: -mentioning

confidence: 78%

Magneto-optical investigation of epitaxial nonstoichiometric Co2MnGe thin films

Trudel

Hamrle

Hillebrands

et al. 2010

Journal of Applied Physics

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“…This model, where cubic and uniaxial anisotropies are superimposed and coincident [108,109], was later invoked by several groups to rationalize similar results for Heusler compounds epitaxially grown on GaAs(001) substrates [102,103,107,117,118].…”

Section: Magnetic Anisotropymentioning

confidence: 82%

“…Yang and coworkers [107] studied this multistep magnetic switching in more detail for Co 2 MnGe grown on GaAs(001). There the free energy density E was given as…”

Section: Magnetic Anisotropymentioning

confidence: 99%

See 1 more Smart Citation

Magnetic anisotropy, exchange and damping in cobalt-based full-Heusler compounds: an experimental review

Trudel

Gaier

Hamrle

et al. 2010

J. Phys. D: Appl. Phys.

226

144

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* Cobalt-based full-Heusler compounds with composition Co2M′ Z (where M ′ is a transition metal and Z is a main group element) are attracting attention due to their predicted half-metallic behaviour, a considerably desired property for spin-dependent electron transport devices. Knowledge of the basic magnetic properties of these materials, in particular in the form of thin films, is required both to fully exploit these promising materials, and to understand their underlying electronic structure and establish structure-property relationships. In this Topical Review, we present a survey of the magnetic anisotropy, exchange, and damping of Co2M ′ Z compounds. These properties are directly related to spin-spin and spin-orbit interactions.

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“…This behavior arises from an additional torque on spins since the induced magnetic field is transverse to the external magnetic field. 41 As presented above in figures 7 and 8, the E-field dependence of the FMR field shift is complicated, depending upon the history of electric polarization, while an external this layered structure has a small magnetic filling factor we assume the strain to be transferred uniformly throughout the Heusler film. The strain-induced internal magnetic field can then be expressed as:…”

Section: Microwave Magnetoelectric Couplingmentioning

confidence: 99%