Magnetic Anisotropy of Heterostructures

Lindner, J.; Farle, Michael

doi:10.1007/978-3-540-73462-8_2

Cited by 19 publications

(16 citation statements)

References 94 publications

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“…25 For example, the shape anisotropy energy density F dem ¼ 1 2 l 0 M 2 cos 2 h decreases with increasing temperature due to the decrease of the magnetization and vanishes at the Curie temperature T C . The mechanism of the temperature dependence of the intrinsic (magnetocrystalline) anisotropy is more complicated.…”

Section: B Local Magnetic Properties and Temperature Dependent Behaviormentioning

confidence: 99%

Uniaxial anisotropy and its manipulation in amorphous Co68Fe24Zr8 thin films (invited)

Barsukov

Meckenstock

et al. 2014

Journal of Applied Physics

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An algorithm to extract effective magnetic parameters of thin film with in-plane uniaxial magnetic anisotropy J. Appl. Phys. 107, 09C507 (2010); 10.1063/1.3357325Pulsed laser ablation deposition of nanocrystalline exchange-coupled Ni 11 Co 11 Fe 67 − x Zr 7 B 4 Cu x ( x = 0 , 1 ) films for planar inductor applicationsWe have proven that the growth of Co 68 Fe 24 Zr 8 layers under external field yields a uniaxial anisotropy, defined by the direction of the field. No magnetic coupling is present between Co 68 Fe 24 Zr 8 layers when separated by a 3 nm of Al 70 Zr 30 . The anisotropy axis can therefore be manipulated at will and the direction can be tailored, layer by layer in multilayers, by the choice of the direction of the applied field during growth. The g-factor (2.13) and the anisotropy constant, obtained from ferromagnetic resonance, support the existence of short-range order. The relation between the temperature dependences of magnetic anisotropy and magnetization are partially captured by Callen-Callen power law. V C 2014 AIP Publishing LLC. [http://dx.

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Section: B Local Magnetic Properties and Temperature Dependent Behaviormentioning

confidence: 99%

Uniaxial anisotropy and its manipulation in amorphous Co68Fe24Zr8 thin films (invited)

Barsukov

Meckenstock

et al. 2014

Journal of Applied Physics

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“…They generally show a linewidth of 4 ± 1 mT, and α = 0.0045 ± 0.001. The 20 particles and 2 dimers have the same effective crystalline anisotropy field 2K 4,eff /M= 50 ± 5 mT which is in between the range of highly crystalline iron thin films 2K 4 /M = 55 mT 11 and iron oxide 2K 4 /M = 38.4 − 46 mT. 14,15 Considering the known morphology of the nanocubes with a ferrimagnetic Fe x O y shell (thickness of d = 7 nm), the magnetization should be reduced to about 40% of the value of bulk iron.…”

Section: B 20 Uncoupled Nanoparticles and 2 Dimersmentioning

confidence: 94%

“…11 Due to the special detection scheme of the microresonator setup, the measured FMR signal is proportional to a combination of the derivative of the dissipative (χ ′′ ) and dispersive (χ ′ ) part of the resonant excitation. The value of an effective α was calculated out of the linewidths taking into account only Gilbert-like damping according to Ref.…”

Section: B 20 Uncoupled Nanoparticles and 2 Dimersmentioning

confidence: 99%

Magnetic anisotropy and relaxation of single Fe/FexOy core/shell- nanocubes: A ferromagnetic resonance investigation

et al. 2016

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In this work a full angle dependent Ferromagnetic Resonance (FMR) investigation on a system of 20 separated Fe/FexOy nanocubes without dipolar coupling is reported. The angular magnetic field dependence of FMR spectra of 20 single particles and 2 dimers were recorded using a microresonator setup with a sensitivity of 106 μB at X-band frequencies. We determine an effective magnetocrystalline anisotropy field of 2K4,eff/M = 50 mT ± 5 mT for selected particles, which is smaller than the one of bulk Fe due to the core shell morphology of the particles. The FMR resonances have a linewidth of 4 mT ± 1 mT, corresponding to a magnetic effective damping parameter α = 0.0045 ± 0.0005 matching the values of high quality iron thin films. Numerical calculations taking into account the different angular orientations of the 24 particles with respect to the external magnetic field yield a good agreement to the experiment.

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“…The identity of lattice parameters for the structures with both types of cover layers excludes difference in the impact of lattice mismatch on the magnetic anisotropy of Au/Co/Au and Au/Co/H-c. The 1% difference between the c-lattice constant of both Au/Co/Au and Au/Co/H-c structures and that of bulk hcp-Co crystal could be explained by the incoherent growth of (0001) oriented hcp Co lattice structure on (111) Au substrate [32 ].…”

Section: A X-ray Diffractionmentioning

confidence: 97%

Impact of organic capping layer on the magnetic anisotropy of ultrathin Co films

Gładczuk¹,

Lasek²,

Puźniak³

et al. 2017

J. Phys. D: Appl. Phys.

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Using combined magnetometry and ferromagnetic resonance studies, it is shown that introduction of a hydrocarbon cover layer leads to an increase of the contribution of the surface anisotropy to the effective magnetic anisotropy energy of hexagonal close-packed 0001 cobalt films, largely enhancing the perpendicular anisotropy. Due to a weak electronic interaction of the organic molecules with the Co atoms, an increase of surface anisotropy could be explained by the presence of an electric field at the organic-material/Co interface and by modification of surface atoms charge configuration.

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Magnetic Anisotropy of Heterostructures

Cited by 19 publications

References 94 publications

Uniaxial anisotropy and its manipulation in amorphous Co68Fe24Zr8 thin films (invited)

Uniaxial anisotropy and its manipulation in amorphous Co68Fe24Zr8 thin films (invited)

Magnetic anisotropy and relaxation of single Fe/FexOy core/shell- nanocubes: A ferromagnetic resonance investigation

Impact of organic capping layer on the magnetic anisotropy of ultrathin Co films

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