Magnetic anisotropy terms in [110] MBE-grown REFe2films involving the strain term εxy

Bowden, G. J.; Groot, P.A.J. de; Rainford, B.D.; Wang, Ke; Martin, K.N.; Zimmermann, Jürgen P.; Fangohr, Hans

doi:10.1088/0953-8984/18/26/006

Cited by 12 publications

(7 citation statements)

References 23 publications

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“…the values of which are given in Bowden et al [22]. The energy term (4) is a superposition of two uniaxial anisotropies of identical weight, one with a symmetry axis in z, the other in y with opposite sign.…”

Section: Materials Parametersmentioning

confidence: 99%

“…For DyFe 2 , the out-of-plane easy axes gradually rotate from ½1 0 0=½0 1 0 towards ½1 1 0 under rising temperature, and the ½0 01 easy axis eventually turns into a hard axis. Zhukov et al [23] stated an out-of-plane angle of the easy directions y % 14 at 290 K. For our simulations, we adjust the DyFe 2 anisotropy parameters to take this into account: theK 0 2 of Bowden et al [22] seems to underestimate the strain. This is apparent in an excessive y determined by simulations where the applied field in [11 0] is gradually relaxed, and the magnetization settles in the out-of-plane anisotropy minimum.…”

Section: Materials Parametersmentioning

confidence: 99%

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Magnetic switching modes for exchange spring systems with competing anisotropies

Zimmermann

Martin

Bordignon

et al. 2009

Journal of Magnetism and Magnetic Materials

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Hard-soft multilayer a b s t r a c tThe magnetization reversal processes of ½10 nm ErFe 2 =nYFe 2 =4 nm DyFe 2 =nYFe 2 multilayer films with a (11 0) growth axis and a variable YFe 2 layer thickness n are investigated. The magnetically soft YFe 2 compound acts as a separator between the hard rare earth (RE) ErFe 2 and DyFe 2 compounds, each of them bearing different temperature dependent magnetic anisotropy properties. Magnetic measurements of a system with n ¼ 20 nm reveal the existence of three switching modes: an independent switching mode at low temperatures, an ErFe 2 spin flop switching mode at medium high temperatures, and an YFe 2 dominated switching mode at high temperatures. The measurements are in qualitative agreement with the findings of micromagnetic simulations which are used to illustrate the switching modes. Further simulations for a varied YFe 2 layer thickness n ranging from 2 to 40 nm are carried out. Quantitative criteria are defined to classify the reversal behavior, and the resultant switching modes are laid out in a map with regard to n and the temperature T. A new coupled switching mode emerges above a threshold temperature for samples with thin YFe 2 separation layers as a consequence of the exchange coupling between the magnetically hard ErFe 2 and DyFe 2 layers. It reflects the increasing competition of the two conflicting anisotropies to dominate the magnetic switching states of both RE compounds under decreasing n.

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Section: Materials Parametersmentioning

confidence: 99%

Section: Materials Parametersmentioning

confidence: 99%

Magnetic switching modes for exchange spring systems with competing anisotropies

Zimmermann

Martin

Bordignon

et al. 2009

Journal of Magnetism and Magnetic Materials

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“…Following Hutchings (1964), Abragam and Bleaney (1970) and Bowden et al (2006), equation ( 5) is transformed to:…”

Section: The Magneto-elastic Hamiltonianmentioning

confidence: 99%

“…In fact, it was the need for such tables that provided one of the major motivations behind this work. Taken together, with the multi-polar anisotropy parameters K4 (T ) etc, of Martin et al (2006), and strain parameters Kxy (T ) etc, of Bowden et al (2006), the modeller has all the I /P parameters required both for free standing and ( 110) and ( 111) MBE grown REFe 2 films.…”

Section: First Order Magnetic Anisotropy Terms For a General Distortionmentioning

confidence: 99%

Magnetic anisotropy basis sets for epitaxial (110) and (111) REFe₂nanofilms

Bowden¹,

Martin²,

Fox³

et al. 2008

J. Phys.: Condens. Matter

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Magnetic anisotropy basis sets for the cubic Laves phase rare earth intermetallic REFe2 compounds are discussed in some detail. Such compounds can be either free standing, or thin films grown in either (110) or (111) mode using molecular beam epitaxy. For the latter, it is useful to rotate to a new coordinate system where the z-axis coincides with the growth axes of the film. In this paper, three symmetry adapted basis sets are given, for multi-pole moments up to n = 12. These sets can be used for free-standing compounds and for (110) and (111) epitaxial films. In addition, the distortion of REFe2 films, grown on sapphire substrates, is also considered. The distortions are different for the (110) and (111) films. Strain-induced harmonic sets are given for both specific and general distortions. Finally, some predictions are made concerning the preferred direction of easy magnetization in (111) molecular beam epitaxy grown REFe2 films.

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“…The DyFe 2 is ferrimagnetic with net magnetization parallel to the Dy moment. The large spin-orbit coupling associated with the Dy 4f moments leads to a fourfold magnetocrystalline anisotropy and also a large strain-induced uniaxial anisotropy that dominates the anisotropy of the superlattice within the plane [14,15]. The anisotropy of the DyFe 2 layers is strongly temperature dependent, so that the coercivity of the superlattice varies from 10 T to 1 T in the range 10-300 K [14,16,17].…”

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confidence: 99%

Ultrafast Optical Parametric Pumping of Magnetization Reorientation and Precessional Dynamics inDyFe2/YFe2Exchange Springs

et al. 2014

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The magnetization dynamics of a wound ½DyFe 2 ð20 ÅÞ=YFe 2 ð80 ÅÞ ×40 exchange spring multilayer have been explored in optical pump probe experiments. Ultrafast optical heating was used to modify the magnetic parameters of the multilayer, while the time resolved magneto-optical Kerr effect was used to probe its response. Although the probe signal is dominated by precession and winding of the exchange spring within the soft YFe 2 layer, reorientation of the DyFe 2 hard-layer magnetization is detected on time scales less than 100 ps. Micromagnetic simulations reproduce the main features of the experimental data and indicate a dramatic optically induced reduction of the hard-layer anisotropy. The results establish the feasibility of switching a spring system by means of parametric excitation.

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Magnetic anisotropy terms in [110] MBE-grown REFe₂films involving the strain term ε_xy

Cited by 12 publications

References 23 publications

Magnetic switching modes for exchange spring systems with competing anisotropies

Magnetic switching modes for exchange spring systems with competing anisotropies

Magnetic anisotropy basis sets for epitaxial (110) and (111) REFe₂nanofilms

Ultrafast Optical Parametric Pumping of Magnetization Reorientation and Precessional Dynamics inDyFe2/YFe2Exchange Springs

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Magnetic anisotropy terms in [110] MBE-grown REFe2films involving the strain term εxy

Cited by 12 publications

References 23 publications

Magnetic switching modes for exchange spring systems with competing anisotropies

Magnetic switching modes for exchange spring systems with competing anisotropies

Magnetic anisotropy basis sets for epitaxial (110) and (111) REFe2nanofilms

Ultrafast Optical Parametric Pumping of Magnetization Reorientation and Precessional Dynamics inDyFe2/YFe2Exchange Springs

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Magnetic anisotropy terms in [110] MBE-grown REFe₂films involving the strain term ε_xy

Magnetic anisotropy basis sets for epitaxial (110) and (111) REFe₂nanofilms