Ultrafast probe of magnetization dynamics in multiferroic 
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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Co</mml:mi><mml:mrow><mml:mn>0.975</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Ge</mml:mi><mml:mrow><mml:mn>0.025</mml:mn></mml:m

Parchenko, Sergii; Hernández, Nazaret Ortiz; Savoini, Matteo; Porer, M.; Decker, Martin; Burganov, Bulat; Bothschafter, Elisabeth M.; Dornes, Christian; Windsor, Yoav William; Ramakrishnan, Mahesh; Rettig, Laurenz; Buzzi, M.; Schick, Daniel; Holldack, K.; Pontius, N.; Schüßler-Langeheine, C.; Radović, M.; Heuver, J. A.; Noheda, Beatriz; Johnson, Steven L.; Staub, U.

doi:10.1103/physrevb.105.064432

Cited by 2 publications

(1 citation statement)

References 49 publications

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“…To gain that information, we performed time‐resolved NIR pump and soft X‐ray probe experiments. We employ soft X‐ray magnetic circular dichroism (XMCD) in reflectivity mode [ 32 ] to determine the magnetization dynamics of the Fe moments occupying octahedral and tetrahedral sites separately.…”

Section: Introductionmentioning

confidence: 99%

Transient Non‐Collinear Magnetic State for All‐Optical Magnetization Switching

Parchenko,

Frej,

Ueda

et al. 2023

Advanced Science

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Resonant absorption of a photon by bound electrons in a solid can promote an electron to another orbital state or transfer it to a neighboring atomic site. Such a transition in a magnetically ordered material could affect the magnetic order. While this process is an obvious road map for optical control of magnetization, experimental demonstration of such a process remains challenging. Exciting a significant fraction of magnetic ions requires a very intense incoming light beam, as orbital resonances are often weak compared to above‐band‐gap excitations. In the latter case, a sizeable reduction of the magnetization occurs as the absorbed energy increases the spin temperature, masking the non‐thermal optical effects. Here, using ultrafast X‐ray spectroscopy, this work is able to resolve changes in the magnetization state induced by resonant absorption of infrared photons in Co‐doped yttrium iron garnet, with negligible thermal effects. This work finds that the optical excitation of the Co ions affects the two distinct magnetic Fe sublattices differently, resulting in a transient non‐collinear magnetic state. The present results indicate that the all‐optical magnetization switching (AOS) most likely occurs due to the creation of a transient, non‐collinear magnetic state followed by coherent spin rotations of the Fe moments.

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Section: Introductionmentioning

confidence: 99%

Transient Non‐Collinear Magnetic State for All‐Optical Magnetization Switching

Parchenko,

Frej,

Ueda

et al. 2023

Advanced Science

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Effect of periodicity on the magnetic anisotropy in spinel oxide superlattices

Motti,

Riddiford,

Vaclavkova

et al. 2023

Phys. Rev. B

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Metamaterials, fabricated by assembling different compounds at the nanoscale, can have properties not found in naturally occurring materials, and therefore offer new avenues to develop novel devices. In the realm of spintronics, where the spin of the electrons is used to extend the capabilities of electronic devices, the quest for such new functional materials has expanded towards magnetic oxides. Here, finding methods to control their magnetic anisotropy is crucial to achieve higher memory density and longer stability. In order to address this challenge, we combined two oxides with a spinel crystal structure, synthesizing CoCr 2 O 4 /CoFe 2 O 4 superlattices with layers only few unit cells thick. We show that the superlattices present a reorientation of the magnetic easy axis from in plane to out of plane when warmed up, at a temperature determined by the periodicity. We can describe this with a model that includes the strain-induced anisotropy of the two materials and their different temperature dependence. This approach to create artificial materials, involving engineering superlattices to tailor the magnetic anisotropy, can be generalized to a wide range of compounds that can be grown strained on suitable substrates.

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Ultrafast probe of magnetization dynamics in multiferroic CoCr2O4 and Co0.975Ge0.025

Cited by 2 publications

References 49 publications

Transient Non‐Collinear Magnetic State for All‐Optical Magnetization Switching

Transient Non‐Collinear Magnetic State for All‐Optical Magnetization Switching

Effect of periodicity on the magnetic anisotropy in spinel oxide superlattices

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