Unusual Field Dependence of the Anomalous Hall Effect in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mi>Ta</mml:mi><mml:mo>/</mml:mo><mml:mi>Tb</mml:mi><mml:mtext>−</mml:mtext><mml:mi>Fe</mml:mi><mml:mtext>−</mml:mtext><mml:mi>Co</mml:mi></mml:math>

Davydova, Margarita; Skirdkov, P. N.; Zvezdin, K. A.; Wu, Jong-Ching; Ciou, Sheng-Zhe; Chiou, Yi-Ru; Ye, Lin-Xiu; Wu, Te‐Ho; Bhatt, Ramesh Chandra; Kimel, A.V.; Zvezdin, A. K.

doi:10.1103/physrevapplied.13.034053

Cited by 22 publications

(13 citation statements)

References 39 publications

(41 reference statements)

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“…Note that this line is located to the right of the magnetization compensation point T M due to the influence of the anisotropy of the rare-earth sublattice. Note, that tricritical point P may located to the left from the compensation due to modifying the surface of the ferrimagnetic by the heavy metal film such as Ta [18]. The line RP transforms into an R P due to the exchange surface anisotropy.…”

Section: Resultsmentioning

confidence: 99%

“…In particular, in the GdFeCo ferrimagnet, triple hysteresis loops are observed above the magnetization compensation temperature [14]. At the same time, experiments with TbFeCo with Ta capping layer [18] show that triple loops can appear to the left of the compensation point. To explain this anomalous hysteresis loop, theoretical models [19] were constructed, in which the interplay of the surface anisotropy, and anisotropies of both sublattices led to a modification of the phase diagrams.…”

Section: Introductionmentioning

confidence: 92%

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Phase transitions in rare-earth ferrimagnets with surface anisotropy near the magnetization compensation point

Yurlov¹,

Zvezdin

Zvezdin³

2021

Preprint

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We report of a theoretical model for calculating the H-T phase diagrams of a rare-earth ferrimagnet, taking into account anisotropies originated by both magnetization sublattices' and by the surface. The possibility of an exchange spring formation due to surface anisotropy is considered. This situation is realized in heterostructures containing a ferrimagnet and a heavy metal. We derive the stability lose lines of the collinear phase from the free energy of the two sublattice ferrimagnet. We numerical calculate the magnetic phase diagrams for the cases when the magnetic field applied along and perpendecular to the easy axis. We demonstrate that tricritical point down at the low field range due to surface anisotropy effect. Moreover, the line of the first order phase transition between angular and collinear phases reduces due to surface anisotropy. In the case when magnetic field is applied perpendicular to the easy axis we show the possibility of the first order phase transition between two collinear phases in contrast to the phase diagram without surface anisotropy.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Phase transitions in rare-earth ferrimagnets with surface anisotropy near the magnetization compensation point

Yurlov¹,

Zvezdin

Zvezdin³

2021

Preprint

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“…[35,36] Furthermore, we assume that the anisotropy is completely dominated by the Gd sublattice, as was claimed earlier in the case of RE-TM alloys and multilayers. [45][46][47][48] More specifically, this means we replace M(T) by M Gd (T) in Equation ( 1) and let only M Gd (T) contribute to the anisotropy energy. The latter assumption, together with the Callen-Callen power law taking n = 3, will greatly reduce the anisotropy field barrier, providing the necessary "kick-start" to the precessional switching process.…”

Section: Magnetization Reversal Based On Llb Formalismmentioning

confidence: 99%

Laser‐Induced Transient Anisotropy and Large Amplitude Magnetization Dynamics in a Gd/FeCo Multilayer

Blank

Hermanussen

Lichtenberg

et al. 2022

Adv Materials Inter

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Ultrafast laser‐induced dynamics in a ferrimagnetic gadolinium iron cobalt (Gd/FeCo) multilayer with a magnetization compensation temperature of TM = 320 K is studied at room temperature as a function of laser‐fluence and strength of the applied magnetic field. The dynamics is found to be substantially different from that in archetypical GdFeCo alloys, and depending on the laser fluence one can distinguish two different regimes. At low laser fluence (⩽1.6 mJ cm‐2), ultrafast laser excitation of the medium triggers spin precession of an extraordinary large amplitude reaching over 30°. At high laser fluence (⩾2.2 mJ cm‐2), the pump heats the medium over the magnetization compensation point, spin precession reduces significantly in amplitude and the process of field‐assisted reversal of magnetization of Gd and FeCo is launched. It is argued that such a distinctly different laser‐induced magnetization dynamics in the multilayers compared to the alloys is due to the symmetry breaking at the numerous interfaces, giving rise to additional surface anisotropy. The temperature dependence of the latter is found to be the key ingredient in the mechanism of ultrafast laser‐induced magnetization dynamics in ferrimagnetic multilayers. Controlling the amount and properties of interfaces in multilayers can thus serve as a mean to achieve efficient ultrafast all‐optical control of magnetism.

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“…Very rich and interesting magnetization dynamics [13,14], in terms of fundamental and applied * zvezdin.ka@phystech.edu physics, is observed in these materials near the points of compensation of magnetization and angular momentum. Moreover, by manipulating the temperature of the ferrimagnet near the compensation points, outstanding magnetization switching characteristics can be obtained [15][16][17]. It has been shown that the electrical current can be an efficient approach to magnetization switching [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Domain wall dynamics of ferrimagnets induced by spin-current near the angular momentum compensation temperature

Yurlov,

Zvezdin,

Skirdkov

et al. 2021

Preprint

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We report on a theoretical study of the spin-current excited dynamics of domain walls (DWs) in ferrimagnets in the vicinity of the angular momentum compensation point. Effective Lagrangian and nonlinear dynamic equations are derived for a two-sublattice ferrimagnet taking into account both spin-torques and external magnetic field. The dynamics of the DW before and after the Walker breakdown is calculated for any direction of the spin current polarization. It is shown that for the in-plane polarization of the spin current, the DW mobility reaches a maximum near the temperature of the angular momentum compensation. For the out-of-plane spin polarization, in contrast, a spin current with the densities below the Walker breakdown does not excite the dynamics of the DW. After overcoming the Walker breakdown, the domain wall velocity increases linearly with increasing the current density. In this spin-current polarization configuration the possibility of a gigahertz oscillation dynamics of the quasi-antiferromagnetic vector under the action of a damping-like torque in the angular momentum compensation point is demonstrated. Possible structures for experimental demonstration of the considered effects are discussed.

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Unusual Field Dependence of the Anomalous Hall Effect in Ta/Tb−Fe−Co

Cited by 22 publications

References 39 publications

Phase transitions in rare-earth ferrimagnets with surface anisotropy near the magnetization compensation point

Phase transitions in rare-earth ferrimagnets with surface anisotropy near the magnetization compensation point

Laser‐Induced Transient Anisotropy and Large Amplitude Magnetization Dynamics in a Gd/FeCo Multilayer

Domain wall dynamics of ferrimagnets induced by spin-current near the angular momentum compensation temperature

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