Synthetic antiferromagnet with Heusler alloy Co2FeAl ferromagnetic layers

Xu, Xiaoguang; Zhang, D. L.; Li, X. Q.; Bao, Jianguo; Jiang, Yong; Jalil, M. B. A.

doi:10.1063/1.3271352

Cited by 12 publications

(10 citation statements)

References 14 publications

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“…Further, SAFs fabricated using a range of ferromagnetic components have been explored including Ni-Fe [38], Co [39,40] and (Fe,Co)N [41]. Additionally, ferromagnetic components created from highly spin-polarized Heusler alloys such as Co 2 FeAl have been reported [42]. In this work, we demonstrate that higher frequencies (in excess of 20 GHz) can be obtained for the zero-field optic mode using SAFs with the structure Co 0.2 Fe 0.6 B 0.2 (5 nm)/Ru(t Ru )/Co 0.2 Fe 0.6 B 0.2 (5 nm), where t Ru is the Ru layer thickness.…”

Section: Introductionmentioning

confidence: 99%

Zero-field Optic Mode Beyond 20 GHz in a Synthetic Antiferromagnet

et al. 2020

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Antiferromagnets have considerable potential as spintronic materials. Their dynamic properties include resonant modes at frequencies higher than can be observed in conventional ferromagnetic materials. An alternative to single-phase antiferromagnets are synthetic antiferromagnets (SAFs), engineered structures of exchange-coupled ferromagnet/nonmagnet/ferromagnet trilayers. SAFs have significant advantages due to the wide-ranging tunability of their magnetic properties and inherent compatibility with current device technologies, such as those used for Spin-transfer-torque magnetic random-access memory production. Here we report the dynamic properties of fully compensated SAFs using broadband ferromagnetic resonance and demonstrate resonant optic modes in addition to the conventional acoustic (Kittel) mode. These optic modes possess the highest zero-field frequencies observed in SAFs to date with resonances of 18 and 21 GHz at the first and second peaks in antiferromagnetic Ruderman-Kittel-Kasuya-Yosida (RKKY) coupling, respectively. In contrast to previous SAF reports that focus only on the first RKKY antiferromagnetic coupling peak, we show that a higher optic mode frequency is obtained for the second antiferromagnetic coupling peak. We ascribe this to the smoother interfaces associated with a thicker nonmagnetic layer. This demonstrates the importance of interface quality to achieving high-frequency optic mode dynamics entering the subterahertz range.

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Section: Introductionmentioning

confidence: 99%

Zero-field Optic Mode Beyond 20 GHz in a Synthetic Antiferromagnet

et al. 2020

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“…Therefore, synthesis of highly ordered CFA thin films continues to be a challenging task. Very few attempts have made to grow CFA thin films on Si substrate 12 13 14 , a combination which is potentially advantageous for the silicon spintronics. In them, a limited success is reported with regards to achieving B2 ordered CFA films 12 .…”

mentioning

confidence: 99%

“…Very few attempts have made to grow CFA thin films on Si substrate 12 13 14 , a combination which is potentially advantageous for the silicon spintronics. In them, a limited success is reported with regards to achieving B2 ordered CFA films 12 . For obtaining the ordered CFA phase, it is highly desirable that while the substrate is maintained at the optimum T s the surface mobility of the ad-atom during the growth of the films is sufficiently high so that they can lower their energy by reaching to their respective atomic sites.…”

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confidence: 99%

Growth of Co2FeAl Heusler alloy thin films on Si(100) having very small Gilbert damping by Ion beam sputtering

Husain

Akansel²,

Kumar³

et al. 2016

Sci Rep

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The influence of growth temperature Ts (300–773 K) on the structural phase ordering, static and dynamic magnetization behaviour has been investigated in ion beam sputtered full Heusler alloy Co2FeAl (CFA) thin films on industrially important Si(100) substrate. The B2 type magnetic ordering is established in these films based on the clear observation of the (200) diffraction peak. These ion beam sputtered CFA films possess very small surface roughness of the order of subatomic dimensions (<3 Å) as determined from the fitting of XRR spectra and also by AFM imaging. This is supported by the occurrence of distinct Kiessig fringes spanning over the whole scanning range (~4°) in the x-ray reflectivity (XRR) spectra. The Gilbert damping constant α and effective magnetization 4πMeff are found to vary from 0.0053 ± 0.0002 to 0.0015 ± 0.0001 and 13.45 ± 00.03 kG to 14.03 ± 0.04 kG, respectively. These Co2FeAl films possess saturation magnetization ranging from 4.82 ± 0.09 to 5.22 ± 0.10 μB/f.u. consistent with the bulk L21-type ordering. A record low α-value of 0.0015 is obtained for Co2FeAl films deposited on Si substrate at Ts ~ 573 K.

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“…These chemical disorders strongly influence the physical properties and result in additional states at the Fermi level therefore reducing the halfmetallicity or spin polarization [7,8]. It is challenging to obtain the ordered L2 1 phase of Heusler alloys in as-deposited films, which is expected to possess the lowest Gilbert damping as compared to the other phases [4,[9][10][11]. Therefore, in the last decade several attempts have been made to grow the ordered phase of CFA thin films employing different methods [4,[9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…It is challenging to obtain the ordered L2 1 phase of Heusler alloys in as-deposited films, which is expected to possess the lowest Gilbert damping as compared to the other phases [4,[9][10][11]. Therefore, in the last decade several attempts have been made to grow the ordered phase of CFA thin films employing different methods [4,[9][10][11][12][13]. The most successful attempts used post-deposition annealing to reduce the anti-site disorder by a thermal activation process [4].…”

Section: Introductionmentioning

confidence: 99%

Temperature-dependent Gilbert damping of Co2FeAl thin films with different degree of atomic order

et al. 2017

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Half-metallicity and low magnetic damping are perpetually sought for in spintronics materials and full Heusler alloys in this respect provide outstanding properties. However, it is challenging to obtain the well-ordered half-metallic phase in as-deposited full Heusler alloys thin films and theory has struggled to establish a fundamentals understanding of the temperature dependent Gilbert damping in these systems. Here we present a study of the temperature dependent Gilbert damping of differently ordered as-deposited Co 2 FeAl full Heusler alloy thin films. The sum of inter-and intraband electron scattering in conjunction with the finite electron lifetime in Bloch states govern the Gilbert damping for the wellordered phase in contrast to the damping of partially-ordered and disordered phases which is governed by interband electronic scattering alone. These results, especially the ultralow room temperature intrinsic damping observed for the well-ordered phase provide new fundamental insights to the physical origin of the Gilbert damping in full Heusler alloy thin films.

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Synthetic antiferromagnet with Heusler alloy Co2FeAl ferromagnetic layers

Cited by 12 publications

References 14 publications

Zero-field Optic Mode Beyond 20 GHz in a Synthetic Antiferromagnet

Zero-field Optic Mode Beyond 20 GHz in a Synthetic Antiferromagnet

Growth of Co2FeAl Heusler alloy thin films on Si(100) having very small Gilbert damping by Ion beam sputtering

Temperature-dependent Gilbert damping of Co2FeAl thin films with different degree of atomic order

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