Noncollinear spin state and unusual magnetoresistance in ferrimagnet Co-Gd

Chen, Dongdong; Xu, Yuanye; Tong, Shucheng; Zheng, Wenhui; Sun, Yiming; Lu, Jun; Lei, Na; Wei, Dahai; Zhao, Jianhua

doi:10.1103/physrevmaterials.6.014402

Cited by 12 publications

(8 citation statements)

References 48 publications

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“…Typically, canted magnetic states are believed to be responsible for SMR signal inversion. 37,38,39 As reported previously, REMR shows similar angular dependence to SMR, which is attributed to the similar physical mechanisms of REMR and SMR. 14 To investigate whether the magnetic moments take on the canted states, MCVA (15)/Al 2 O 3 (3) film was subjected to magnetism measurements both in-plane and out-of-plane within ± 90 kOe.…”

Section: Resultssupporting

confidence: 87%

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The anomalous Hall effects and Rashba-Edelstein magnetoresistance in the ferrimagnetic Mn1.84Co0.46V0.86Al film

Xu,

Dou,

Zhao

et al. 2023

Preprint

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Ferrimagnets have attracted increasing attention in spintronics due to the possibility of easy manipulation by magnetic or electric fields. In this study, we report the anomalous Hall effect (AHE) and Rashba-Edelstein magnetoresistance (REMR) in the new ferrimagnetic Mn1.84Co0.46V0.86Al (MCVA) films. The anomalous Hall resistivity (ρxy) changes gradually from negative to positive values with increasing film thickness. By separating the contributions of AHE, it is demonstrated that the thickness dependence origins from the competition between the skew scattering contribution and the sum of the side jumping and intrinsic terms. Besides the intrinsic bulk effect of MCVA, the interface Rashba-Edelstein effect also obviously influences the transport property of MCVA-based devices due to interfacial spin-orbit coupling (SOC). As the magnetic field increasing, the magnetic moments of MCVA switch from collinear to non-collinear, resulting in an inversion of the REMR signal of MCVA/Al2O3 devices. The magnetic coupling state evolution in MCVA gives a pathway for signal inversion in REMR at interfaces without heavy metal layer, which provides valuable ideas for spintronic device design.

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Section: Resultssupporting

confidence: 87%

“…Furthermore, the magnetic field less than the saturation field (H s ) is insufficient to align the moments in favor of the minimum Zeeman energy, and the canted angle increases with the external magnetic field increasing. 37 This is the reason why the REMR signal is not saturated under ±90 kOe in Fig. S3.…”

Section: Resultsmentioning

confidence: 92%

The anomalous Hall effects and Rashba-Edelstein magnetoresistance in the ferrimagnetic Mn1.84Co0.46V0.86Al film

Xu,

Dou,

Zhao

et al. 2023

Preprint

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show abstract

“…These exhibit ferromagnetic-like properties when undercompensated and show antiferromagnetic-like behaviour when fully compensated. In spintroincs technology, the former is useful because of easy detection and control of net magnetization of ferrimagnets while the latter provides fast magnetic-dynamics [7] with high-dense storage capacity [2]. Ferrimagnets, when coexisting with no other ordered magnetic phase(s), have been reported to exhibit varied magnetic hysteresis loops depending on the compensation of oppositely aligned spins.…”

Section: Introductionmentioning

confidence: 99%

Revealing magnetic and physical properties of TbFe_4.4Al_7.6: experiment and theory

Samatham,

Singh,

Shravan Kumar Reddy

et al. 2024

J. Phys.: Condens. Matter

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We report on the magnetic, electrical transport, caloric and electronic structure properties of TbFe4.4Al7.6 polycrystalline alloy using experiment and theory. The alloy crystallizes in tetragonal structure with I4/mmm space group with lattice parameters a = b = 8.7234(5) Å and c = 5.0387(6) Å. It is ferrimagnetic with a compensation temperature of T cmp ∼ 151 K, Curie-Weiss temperature θ CW ∼ 172.11 K and an effective magnetic moment μeff = (2.37±0.07) μB/f.u with Z = 2. At low temperatures, kinetic arrest-like first-order phase transition is realized through the thermal hysteresis between field-cooled cooling and field-cooled warming curves of M(T) and virgin curves of M(H) and ρ(H) which are outside the hysteresis loops with metamagnetic transition. The high magnetic field suppression of multiple transitions and reduced coercive field H coer and remnant magnetization M rem with increasing temperature are reported. H coer and M rem cease to exist above the compensation temperature T cmp. A correlation between the isothermal magnetization and resistivity is discussed. Specific heat C(T) analysis reveals a Sommerfeld parameter of γ = 0.098 J.mol-1.K-2 and a Debye temperature of θ D ∼ 351.2 K. The sample is metallic as inferred from the ρ(T) behavior and Sommerfeld parameter. The magnetoresistance of the alloy is low and negative which indicates the suppression of weak spin-fluctuations. This alloy avoids the tricritical point despite first-to-second order phase transition. The electronic and magnetic structure calculations, by making use of full potential linearized augmented plane wave (FP-LAPW) method, suggest metallic ferrimagnetic ground state of TbFe4.4Al7.6 with Tb atoms contributing ferromagnetically (5.87 μB) and Fe atoms with antiferromagnetic contribution (2.67 μB), in close agreement with the experimental observation.

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“…[10] However, the interfacial PMA originated from the CoFeB/MgO interface is insufficient to maintain high thermal stability for MTJs at reduced dimension smaller than 20 nm. [11,12] To achieve stronger PMA for future sub-10 nm technology node, a number of material systems, such as Co(Tb,Gd), [13,14] L1 0 -ordered FePt, [15] MnGa [16] alloys and CoPt [17] multilayers have been explored, which have significant magnetocrystalline anisotropy. The bulk PMA in such alloys is very sensitive to the crystal structures of the films, and requires epitaxial growth or strict heat treatment.…”

Section: Introductionmentioning

confidence: 99%

Spin–orbit torque in perpendicularly magnetized [Pt/Ni] multilayers

et al. 2023

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The performance of SOT in HM/FM periodic multilayers has attracted widespread attention. In this report, we have successfully fabricated a series of perpendicular magnetized [Pt(2-t)/Ni(t)]4 multilayers, and studied the SOT in the multilayers by varying the thickness of Ni layer t. The current induced magnetization switching was achieved with a critical current density of 1×107 A/cm2. The damping-like SOT efficiency ξDL was extracted from an extended harmonic Hall measurements. We demonstrate that the ξDL can be effectively modulated by t Pt/t Ni ratio of Pt and Ni in the multilayers. The SOT investigation about the [Pt/Ni]N multilayers might provide new material candidates toward practical perpendicular SOT-MRAM devices.

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Noncollinear spin state and unusual magnetoresistance in ferrimagnet Co-Gd

Cited by 12 publications

References 48 publications

The anomalous Hall effects and Rashba-Edelstein magnetoresistance in the ferrimagnetic Mn1.84Co0.46V0.86Al film

The anomalous Hall effects and Rashba-Edelstein magnetoresistance in the ferrimagnetic Mn1.84Co0.46V0.86Al film

Revealing magnetic and physical properties of TbFe_4.4Al_7.6: experiment and theory

Spin–orbit torque in perpendicularly magnetized [Pt/Ni] multilayers

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Noncollinear spin state and unusual magnetoresistance in ferrimagnet Co-Gd

Cited by 12 publications

References 48 publications

The anomalous Hall effects and Rashba-Edelstein magnetoresistance in the ferrimagnetic Mn1.84Co0.46V0.86Al film

The anomalous Hall effects and Rashba-Edelstein magnetoresistance in the ferrimagnetic Mn1.84Co0.46V0.86Al film

Revealing magnetic and physical properties of TbFe4.4Al7.6: experiment and theory

Spin–orbit torque in perpendicularly magnetized [Pt/Ni] multilayers

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Revealing magnetic and physical properties of TbFe_4.4Al_7.6: experiment and theory