Thermally Assisted All‐Optical Helicity Dependent Magnetic Switching in Amorphous Fe100–xTbx Alloy Films

Hassdenteufel, Alexander; Hebler, Birgit; Schubert, Christian; Liebig, Andreas; Teich, M.; Helm, M.; Aeschlimann, Martin; Albrecht, Manfred; Bratschitsch, Rudolf

doi:10.1002/adma.201300176

Cited by 134 publications

(86 citation statements)

References 33 publications

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“…The inertial dynamics is also believed to be a key ingredient in the optical manipulation of rare-earth transition-metal ferrimagnets, for example, in GdFeCo (Stanciu et al, 2007), FeTb (Hassdenteufel et al, 2013), and TbCo, DyCo, or HoFeCo (Mangin et al, 2014) alloys. It is however absent in ferromagnets (after an ultrashort field pulse, the magnetization falls back to the lowest energy state).…”

Section: B Optical Manipulationmentioning

confidence: 99%

Antiferromagnetic spintronics

et al. 2018

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Antiferromagnetic materials could represent the future of spintronic applications thanks to the numerous interesting features they combine: they are robust against perturbation due to magnetic fields, produce no stray fields, display ultrafast dynamics, and are capable of generating large magnetotransport effects. Intense research efforts over the past decade have been invested in unraveling spin transport properties in antiferromagnetic materials. Whether spin transport can be used to drive the antiferromagnetic order and how subsequent variations can be detected are some of the thrilling challenges currently being addressed. Antiferromagnetic spintronics started out with studies on spin transfer and has undergone a definite revival in the last few years with the publication of pioneering articles on the use of spin-orbit interactions in antiferromagnets. This paradigm shift offers possibilities for radically new concepts for spin manipulation in electronics. Central to these endeavors are the need for predictive models, relevant disruptive materials, and new experimental designs. This paper reviews the most prominent spintronic effects described based on theoretical and experimental analysis of antiferromagnetic materials. It also details some of the remaining bottlenecks and suggests possible avenues for future research. This review covers both spin-transfer-related effects, such as spin-transfer torque, spin penetration length, domain-wall motion, and "magnetization" dynamics, and spin-orbit related phenomena, such as (tunnel) anisotropic magnetoresistance, spin Hall, and inverse spin galvanic effects. Effects related to spin caloritronics, such as the spin Seebeck effect, are linked to the transport of magnons in antiferromagnets. The propagation of spin waves and spin superfluids in antiferromagnets is also covered.

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Section: B Optical Manipulationmentioning

confidence: 99%

Antiferromagnetic spintronics

et al. 2018

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“…Thus, AOS may lead to technological breakthroughs by using polarized light for ultrafast magnetization manipulation for a variety of applications. Since this pioneering experimental discovery, AOS has also been demonstrated for a variety of other amorphous ferrimagnetic RE-TM alloys, such as TbFe (Hassdenteufel et al, 2013(Hassdenteufel et al, , 2015Schubert et al, 2014), TbCo (Alebrand et al, 2012), TbFeCo (Finazzi et al, 2013), DyCo , HoFeCo , and just very recently for antiferromagnetically coupled heterostructures Schubert et al, 2014) as well as for ferromagnetic materials . Considerable recent effort has been made to investigate the physics of AOS and to reveal the underlying microscopic mechanisms.…”

Section: Hebler Et Al Ferrimagnetic Tb-fe Alloy Thin Filmsmentioning

confidence: 99%

Ferrimagnetic Tb–Fe Alloy Thin Films: Composition and Thickness Dependence of Magnetic Properties and All-Optical Switching

et al. 2016

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Ferrimagnetic rare earth -transition metal Tb-Fe alloy thin films exhibit a variety of different magnetic properties, which depend strongly on composition and temperature. In this study, first the influence of the film thickness (5-85 nm) on the sample magnetic properties was investigated in a wide composition range between 15 and 38 at.% of Tb. From our results, we find that the compensation point, remanent magnetization, and magnetic anisotropy of the Tb-Fe films depend not only on the composition but also on the thickness of the magnetic film up to a critical thickness of about 20-30 nm. Beyond this critical thickness, only slight changes in magnetic properties are observed. This behavior can be attributed to a growth-induced modification of the microstructure of the amorphous films, which affects the short range order. As a result, a more collinear alignment of the distributed magnetic moments of Tb along the out-of-plane direction with film thickness is obtained. This increasing contribution of the Tb sublattice magnetization to the total sample magnetization is equivalent to a sample becoming richer in Tb and can be referred to as an "effective" composition. Furthermore, the possibility of all-optical switching, where the magnetization orientation of Tb-Fe can be reversed solely by circularly polarized laser pulses, was analyzed for a broad range of compositions and film thicknesses and correlated to the underlying magnetic properties.

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“…11,[31][32][33][34][35][36] Recently we showed that a minimum amount of laser energy input of the order of the energy gap between the two ferrimagnetic modes, i.e.h∆ω ∼hω ex ∼ J RT (M FeCo (T 0 ) − M Gd (T 0 )), is required for the formation of the TFLS, 11 where ω ex is the frequency of the so-called antiferromagnetic coherent exchange mode. The disordered nature of the GdFeCo spin lattice leads an effect that the most efficient energy transfer (the smallest energy gap) does not correspond exactly to the coherent mode with k = 0 but to non-zero k value, related to the characteristic length of the Gd spins cluster size.…”

Section: B Formation Of the Transient Ferromagnetic Like Statementioning

confidence: 99%

Controlling the polarity of the transient ferromagneticlike state in ferrimagnets

et al. 2014

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It was recently observed that the two antiferromagnetically coupled sublattices of a rare earth-transition metal ferrimagnet can temporarily align ferromagnetically during femtosecond laser heating, but always with the transition metal aligning in the rare earth direction. This behavior has been attributed to the slower magnetization dynamics of the rare earth sublattice. The aim of this work was to assess how the difference in the speed of the transition metal and rare earth dynamics affects the formation of the transient ferromagnetic-like state and consequently controls its formation. Our investigation was performed using extensive atomistic spin simulations and analytic micromagnetic theory of ferrimagnets, with analysis of a large area of parameter space such as initial temperature, Gd concentration and laser fluence. Surprisingly, we found that at high temperatures, close to the Curie point, the rare earth dynamics become faster than those of the transition metal. Subsequently we show that the transient state can be formed with the opposite polarity, where the rare earth aligns in the transition metal direction. Our findings shed light on the complex behavior of this class of ferrimagnetic materials and highlight an important feature which must be considered, or even exploited, if these materials are to be used in ultrafast magnetic devices.

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Thermally Assisted All‐Optical Helicity Dependent Magnetic Switching in Amorphous Fe_100–xTb_x Alloy Films

Cited by 134 publications

References 33 publications

Antiferromagnetic spintronics

Antiferromagnetic spintronics

Ferrimagnetic Tb–Fe Alloy Thin Films: Composition and Thickness Dependence of Magnetic Properties and All-Optical Switching

Controlling the polarity of the transient ferromagneticlike state in ferrimagnets

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