Ferrimagnetic properties of Co/(Gd–Co) multilayers

Svalov, A. V.; Fernández, Antonio Maestro; Vas’kovskiy, V. O.; Tejedor, M.; Orúe, I.; Kurlyandskaya, G.V.

doi:10.1016/j.jmmm.2006.02.192

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…We attribute this to the effect of Joule heating induced by the current pulses. Earlier studies show that the Gd magnetization is quenched more severely during Joule heating than that of Co. [27][28][29]36] The consequence is that at higher temperature relatively more Gd than at RT is needed to achieve compensation. This fact is confirmed for our stacks by the upward shift of the compensation thickness with increasing sample temperature using polar MOKE (see Figure 2d).…”

Section: Introduction and Resultsmentioning

confidence: 99%

Ultrafast Racetrack Based on Compensated Co/Gd‐Based Synthetic Ferrimagnet with All‐Optical Switching

Koopmans

et al. 2022

Adv Elect Materials

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the Dzyaloshinskii-Moriya interaction (DMI) [6][7][8] with synthetic antiferromagnets (SAFs), which resulted in reported DW velocities close to 750 m s -1 . [9] Despite the large improvement, the energy efficiency is still limited due to the weak strength of the antiferromagnetic (AF) coupling. Therefore, the materials platform of rare earth (RE)-transition metal (TM) compounds garnered considerable attention, [1] promising faster CIDWM due to the much stronger direct AF coupling than the indirect exchange coupling [10] utilized in SAFs. Furthermore, the SOTs used to drive the DW promise to be highly efficient in the RE-TM systems as a result of the long spin coherence length. [11] Cosequently, high velocity CIDWM has been reported in Co-Gdbased ferrimagnetic alloy systems [12,13] when the angular momentum in the magnetic material is compensated, being at least a factor of three faster than that of the previously reported SAFs.Besides the efficient CIDWM, single pulse all-optical switching (AOS) of the magnetization [14,15] in the RE-TM systems has obtained significant attention thanks to its subpicosecond [16] energy efficient [14,17,18] magnetization switching enabled by the ultrafast angular momentum transfer upon laser excitation. [19] This can be useful as a new generation of ultrafast magnetic memory, as well as a data buffer between electronics and integrated photonics. [14,20,21] Recently, a synthetic ferrimagnetic system based on a Pt/Co/Gd- [18,22] layered structure has shown high robustness [23] for such a hybrid integration. These kinds of synthetic ferrimagnets have some distinct advantages over RE-TM alloys. For instance, AOS is not limited by the exact composition. [24] They also withstand thermal annealing [25] and offer easier magnetic composition control at wafer scale than the alloy system, as well as better access to interface engineering. Therefore, it has been proposed that such a materials platform has high potential to realize a hybrid integration of DW memory in photonic platforms to further enhance their storage density. [20,26] So far, the CIDWM of Co/Gd bilayers [26,27] has been investigated. However, the highest reported velocity, achieved at cryogenic conditions, [27] was several times lower than that reported in alloys, [12] in part due to large net angular momentum, low compensation temperature as well as DW pinning effects. In this report, we therefore propose a materials platform based on the [Co/Gd] 2 synthetic ferrimagnet capable of accommodating both efficient CIDWM of over 2 km s -1 ) at room temperature

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Section: Introduction and Resultsmentioning

confidence: 99%

Ultrafast Racetrack Based on Compensated Co/Gd‐Based Synthetic Ferrimagnet with All‐Optical Switching

Koopmans

et al. 2022

Adv Elect Materials

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“…Due to the interlayer exchange, the magnetic moments of Gd-Co and Co layers are antiparallel; i.e. [Co/(Gd-Co)] 4 /Co multilayers form a macroscopic ferrimagnet with a compensation temperature determined by the thickness ratio of the layers [7]. In low fields the magnetizations of Co and Gd-Co layers are aligned antiparallel to the axis of the applied field.…”

Section: Methodsmentioning

confidence: 99%

Magnetic transition in Co/(Gd–Co) multilayers

Svalov¹,

Fernández²,

Vas’kovskiy³

et al. 2008

Journal of Magnetism and Magnetic Materials

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Thermodynamic re-modeling of the Co–Gd system

Wang

Guo

et al. 2010

International Journal of Materials Research

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The Co–Gd system was re-assessed using the CALPHAD technique. The solution phases (liquid, body-centered cubic, face-centered cubic and hexagonal close-packed) were described by the substitutional solution model. The temperature dependence of the interaction parameters of the liquid phase was separately expressed by the linear function and Kaptay equation. The intermetallic compounds Co17Gd2 and Co5Gd, which have the same CaCu5-type structure, were treated as one phase and described by a three-sublattice model (Co2, Gd)(Co2, Gd)2Co15, with Co2 and Gd mixing on the first and second sublattices and the third sublattice occupied by Co. The other compounds (Co7Gd2, Co3 Gd, Co2Gd, Co3Gd4 and CoGd3) were treated as stoichiometric compounds. Two sets of self-consistent thermodynamic parameters of the Co–Gd system were obtained.

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Ferrimagnetic properties of Co/(Gd–Co) multilayers

Cited by 3 publications

References 5 publications

Ultrafast Racetrack Based on Compensated Co/Gd‐Based Synthetic Ferrimagnet with All‐Optical Switching

Ultrafast Racetrack Based on Compensated Co/Gd‐Based Synthetic Ferrimagnet with All‐Optical Switching

Magnetic transition in Co/(Gd–Co) multilayers

Thermodynamic re-modeling of the Co–Gd system

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