Spin-reorientation transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ni</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>alloy films

Thamankar, R.; Ostroukhova, A.; Schumann, F. O.

doi:10.1103/physrevb.66.134414

Cited by 17 publications

(10 citation statements)

References 34 publications

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“…This is consistent with earlier studies of fcc-like Py films. 29,30 Nevertheless, we are still able to obtain PMA and the corresponding H c enhancement in the Py bilayered system with t Mn > 4 ML, implying also a correlation with the AFM-FM exchange coupling. 10…”

Section: B Magnetic Domain Imaging On 6 MLmentioning

confidence: 75%

Driving magnetization perpendicular by antiferromagnetic-ferromagnetic exchange coupling

Wang

Jih

Lin³

et al. 2011

Phys. Rev. B

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Using x-ray photoemission electron microscopy and the magneto-optical Kerr effect, we have demonstrated a perpendicular magnetic anisotropy that could be due to exchange coupling between the ferromagnetic and antiferromagnetic layers. The results of magnetic imaging and hysteresis loops show that the magnetization of Fe and permalloy (Py) films orients from the in-plane to perpendicular direction, as an Mn underlayer is above a threshold value that depends on the Fe or Py layer thickness. Their thickness-dependent behaviors can be quantitatively described by a phenomenological model that takes into account the finite-size effect of the antiferromagnet on exchange coupling. The anisotropy energy extracted from the model and the thermal stability of perpendicular magnetization enhanced with the increase of the Mn underlayer further demonstrate the exchange coupling nature.

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Section: B Magnetic Domain Imaging On 6 MLmentioning

confidence: 75%

Driving magnetization perpendicular by antiferromagnetic-ferromagnetic exchange coupling

Wang

Jih

Lin³

et al. 2011

Phys. Rev. B

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“…10 Therefore, this material seems to be very promising for the structural as well as magnetic applications. [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] It is noticed that the SRT is generally observed in case of ultrathin ferromagnetic multilayers, where the interface between the film and the substrate plays a crucial role. This is not only useful for the magnetic applications, but it also allows us to utilize its excellent mechanical properties, with piezoelectric and optical properties of other important semiconducting oxides, and their integration with silicon integrated circuit technology.…”

Section: Introductionmentioning

confidence: 99%

Observation of unusual magnetic behavior: Spin reorientation transition in thick Co–Fe–Ta–B glassy films

Sharma

Kimura

Inoue

2006

Journal of Applied Physics

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Effects of transition metal substitution on the glass-formation ability and magnetic properties of Fe 62 Co 9.5 Nd 3 Dy 0.5 B 25 glassy alloy Atomically smooth Co-Fe-Ta-B glassy films were deposited on variety of substrates ͑Si, SiO 2 , and keptone͒. An extensive magnetic characterization in the temperature range from 5 to 330 K is reported for the films of thickness up to ϳ5.5 m. A reversible spin reorientation transition ͑SRT͒ from in-plane single domainlike state to out-of-plane multidomain state with increase in measuring temperature from 5 to 330 K was observed in the films of thickness up to ϳ2.5 m, in contrast to previously reported ultrathin ferromagnetic films of transition metals consisting of about half a dozen of monolayers. The SRT temperature ͑T SRT ͒ is dependent on the film thickness and the applied magnetic field and is not governed by the temperature dependent magnetocrystalline anisotropy or the anisotropy at the film-substrate interface, which are the most common cause for the SRT in magnetic materials. Atomic relaxation has significant influence on SRT. The relaxed state results in a shift in T SRT to higher temperature or disappearance of SRT. We have compared our results with the reported data on ultrathin ferromagnetic films and shown that the atomic randomness and the strains/stress are responsible for the SRT in present case.

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“…The tetragonal distortion of the lattice suggests that the magnetoelastic energy could be actively involved in the control of the spin alignment. According to Schulz and Baberschke 9 and Thamankar et al, 10 the magnetoelastic anisotropy energy associated with the tetragonal distortion of the lattice in a ͑100͒ oriented film is formulated as K me =3/2͓ ͓100͔ ͑C 11 − C 12 ͒͑ 2 − 1 ͔͒. ͓100͔ is the magnetostriction constant along the ͓100͔ crystallographic direction, and C 11 and C 12 are the elastic constants.…”

mentioning

confidence: 99%

Reorientation of magnetic anisotropy in epitaxial cobalt ferrite thin films

et al. 2007

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Spin reorientation has been observed in CoFe 2 O 4 thin single crystalline films epitaxially grown on ͑100͒ MgO substrate upon varying the film thickness. The critical thickness for such a spin-reorientation transition was estimated to be 300 nm. The reorientation is driven by a structural transition in the film from a tetragonal to cubic symmetry. At low thickness, the in-plane tensile stress induces a tetragonal distortion of the lattice that generates a perpendicular anisotropy, large enough to overcome the shape anisotropy and to stabilize the magnetization easy axis out of plane. However, in thicker films, the lattice relaxation toward the cubic structure of the bulk allows the shape anisotropy to force the magnetization to be in plane aligned. The importance of magnetic anisotropy is well recognized in many technical applications such as magnetic and magneto-optic recording. The large interest for high anisotropies is motivated by technological demands such as increasing the magnetic recording density. With large anisotropy, the superparamagnetic limit can be pushed down, and a stable magnetization can be promoted in ultrasmall nanosized magnetic structures, which are needed in advanced media for ultrahigh density recording. Besides the intrinsic anisotropy of the bulk, other sources of anisotropy may be enhanced in artificial structures and contribute to their magnetic properties. Depending on their relative orientations and magnitudes, the involved anisotropies may compete between each other, leading to spin-reorientation phenomena in the system. For example, the broken symmetry at the interfaces in ultrathin films generates a perpendicular anisotropy, which overcomes the shape anisotropy.1 However, increasing the layer thickness reduces the ratio between the surface and the volume atoms, leading to an in-plane alignment of the easy axis.2 In obliquely sputtered metallic thin films, we established the existence of an in-plane reorientation of magnetic anisotropy.3 Depending on the film thickness and due to the shadow effect during the growth, the layer can develop columns or nuclei able to confine the anisotropy parallel or perpendicular to the longitudinal direction ͑projection of the incident beam in the film plane͒.Ferrites cover a large family of oxides, including soft as well as hard magnetic materials. Hard ferrites such as the hexagonal ͑BaFe 12 O 19 ͒ and the spinel ͑CoFe 2 O 4 ͒ are particularly attractive for magnetic and magneto-optic recording applications due to their large magnetocrystalline anisotropy and high chemical stability. Recent studies demonstrated that integrating cobalt ferrite as a pinning layer in the spin valve architecture can strongly enhance the magnetoresistance effect of the sandwiched structure. 4 In epitaxial hexaferrite thin films, the uniaxial magnetocrystalline anisotropy is strong enough to dominate all the other sources of anisotropy and to keep the spin alignment constant regardless the film thickness and the preparation conditions. 5 However, cobalt ferrite rep...

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Spin-reorientation transition inFexNi1−xalloy films

Cited by 17 publications

References 34 publications

Driving magnetization perpendicular by antiferromagnetic-ferromagnetic exchange coupling

Driving magnetization perpendicular by antiferromagnetic-ferromagnetic exchange coupling

Observation of unusual magnetic behavior: Spin reorientation transition in thick Co–Fe–Ta–B glassy films

Reorientation of magnetic anisotropy in epitaxial cobalt ferrite thin films

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