Pressure-induced spin reorientation transition in layered ferromagnetic insulator 
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Lin, Zhisheng; Lohmann, Mark; Ali, Zulfikhar A.; Tang, Chi; Li, Junxue; Xing, Wenyu; Zhong, Jiangnan; Jia, Shuang; Han, Wei; Coh, Sinisa; Beyermann, W. P.; Shi, Jing

doi:10.1103/physrevmaterials.2.051004

Cited by 82 publications

(57 citation statements)

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“…A negative AMR is opposite to the conventional behavior of ferromagnets. However, it is seen in systems such as Fe3O4 [16] and 2D ferromagnets such as Cr2Ge2Te6 [17] and Fe3GeTe2 [18]. Conduction by the minority spin carriers has been suggested as the reason behind a negative AMR [19].…”

Section: Resultsmentioning

confidence: 99%

Magnetotransport as a diagnostic of spin reorientation: Kagome ferromagnet as a case study

et al. 2019

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While in most ferro or antiferromagnetic materials there is a unique crystallographic direction, including crystallographically equivalent directions, in which the moments like to point due to spinorbit coupling, in some, the direction of the spin reorients as a function of a certain physical parameter such as temperature, pressure etc. Fe3Sn2 is a kagome ferromagnet with an onset of ferromagnetism below 650 K, and undergoes a spin reorientation near 150 K. While it is known that the moments in Fe3Sn2 point perpendicular to the kagome plane at high temperatures and parallel to the kagome plane at low temperatures, how the distribution of the magnetic domains in the two different spin orientations evolve throughout the spin reorientation is not well known. Furthermore, while there have been various reports on the magnetotransport properties in the Hall configuration, the angular dependence of magnetoresistance has not been studied so far. In this paper, we have examined the spin reorientation by using anisotropic magnetoresistivity in detail, exploiting the dependence of the resistivity on the direction between magnetization and applied current. We are able to determine the distribution of the magnetic domains as a function of temperature between 360 K to 2 K and the reorientation transition to peak at 120 K. We discover that both out of plane and in plane phases coexist at temperatures around the spin reorientation, indicative of a first order transition. Although the volume of the magnetic domains in the different phases sharply changes at the spin reorientation transition, the electronic structure for a specific magnetization is not influenced by the spin reorientation. In contrast, we observe an electronic transition around 40 K, hitherto unreported, and reflected in both the zero-field resistivity and anisotropic resistivity. Introduction:Kagome Fe3Sn2 orders ferromagnetically below a Curie temperature of TC = 640 K based on SQUID magnetometry [1]. Previous studies using Mossbauer spectroscopy reported a Curie temperature of 612 K[2] and 657 K [3]. Below the ordering temperature, the easy axis of magnetization is parallel to the crystallographic c-axis. Initial study using Mossbauer spectroscopy noticed that a transition (SRT) occurs at 114 K[2]. Following studies using Mossbauer spectroscopy suggested that below 220 K, there are abrupt spin rotations occurring over a large temperature range 0-220 K with the spin direction close to the ab Kagome plane at low temperatures [3]. Further studies investigating the spin rotation using neutron diffraction combined with Mossbauer spectroscopy noted that the rotation is more complicated than a continuous rotation described by a unique angle or a simple abrupt rotation [4].The spin reorientation transition (SRT) was recently revisited, using powder neutron diffraction, where the transition was suggested to occur over a large temperature range from 570 K to 75 K[1]. The order of the transition is not discussed in any of the previous reports and they report very broad tr...

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Section: Resultsmentioning

confidence: 99%

Magnetotransport as a diagnostic of spin reorientation: Kagome ferromagnet as a case study

et al. 2019

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“…Motivated by the above-mentioned aspects, Cr 2 Ge 2 Te 6 received considerable attention both experimentally [11,[17][18][19][20][21][22][23] and theoretically [5,24] during the last years. Aiming at a detailed understanding of the magnetic properties of this material, in bulk as well as in monolayer form, a quantitative characterization of the magnetic anisotropies represents a key task.…”

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confidence: 99%

Magnetic anisotropy and spin-polarized two-dimensional electron gas in the van der Waals ferromagnet Cr2Ge2Te6

et al. 2019

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We report a comprehensive experimental investigation on the magnetic anisotropy in bulk single crystals of Cr2Ge2Te6, a quasi-two-dimensional ferromagnet belonging to the family of magnetic layered transition metal trichalcogenides that have attracted recently a big deal of interest with regard to the fundamental and applied aspects of two-dimensional magnetism. For this purpose electron spin resonance (ESR) and ferromagnetic resonance (FMR) measurements have been carried out over a wide frequency and temperature range. A gradual change in the angular dependence of the ESR linewidth at temperatures above the ferromagnetic transition temperature Tc reveals the development of two-dimensional spin correlations in the vicinity of Tc thereby proving the intrinsically low-dimensional character of spin dynamics in Cr2Ge2Te6. Angular and frequency dependent measurements in the ferromagnetic phase clearly show an easy-axis type anisotropy of this compound. Furthermore, these experiments are compared with simulations based on a phenomenological approach, which takes into account results of static magnetization measurements as well as high temperature g factors obtained from ESR spectroscopy in the paramagnetic phase. As a result the determined magnetocrystalline anisotropy energy density (MAE) KU is (0.48 ± 0.02) × 10 6 erg/cm 3 . This analysis is complemented by density functional calculations which yield the experimental MAE value for a particular value of the electronic correlation strength U . The analysis of the electronic structure reveals that the low-lying conduction band carries almost completely spin-polarized, quasihomogeneous, two-dimensional states. arXiv:1810.02560v3 [cond-mat.str-el]

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“…Magnetization measurements are performed on bulk CGT crystals using a SQUID magnetometer. The Curie temperature, T c ~ 61 K, was determined from the abrupt drop in magnetization in the temperature dependence from 5 K -300 K when a 1 kOe magnetic field is applied parallel to the a-b plane of the crystal 9,10 . Magnetization measurements below T c with an external magnetic field either parallel or perpendicular to the a-b plane reveal soft ferromagnetic behavior with perpendicular magnetic anisotropy determined by comparison of the field required to saturate all the spins in both geometries, i.e., H ‖ sat > H ꓕ sat 9,10 .…”

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Probing Magnetism in Insulating Cr₂Ge₂Te₆ by Induced Anomalous Hall Effect in Pt

Lohmann

Niu

et al. 2019

Nano Lett.

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Two-dimensional ferromagnet Cr 2 Ge 2 Te 6 (CGT) is so resistive below its Curie temperature that probing its magnetism by electrical transport becomes extremely difficult. By forming heterostructures with Pt, however, we observe clear anomalous Hall effect (AHE) in 5 nm thick Pt deposited on thin (< 50 nm) exfoliated flakes of CGT. The AHE hysteresis loops persist to ~ 60 K, which matches well to the Curie temperature of CGT obtained from the bulk magnetization measurements. The slanted AHE loops with a narrow opening indicate magnetic domain formation, which is confirmed by low-temperature magnetic force microscopy (MFM) imaging. These results clearly demonstrate that CGT imprints its magnetization in the AHE signal of the Pt layer. Density functional theory calculations of CGT/Pt heterostructures suggest that the induced ferromagnetism in Pt may be primarily responsible for the observed AHE. Our results establish a powerful way of investigating magnetism in 2D insulating ferromagnets which can potentially work for monolayer devices.

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Pressure-induced spin reorientation transition in layered ferromagnetic insulator Cr2Ge2Te6

Cited by 82 publications

References 23 publications

Magnetotransport as a diagnostic of spin reorientation: Kagome ferromagnet as a case study

Magnetotransport as a diagnostic of spin reorientation: Kagome ferromagnet as a case study

Magnetic anisotropy and spin-polarized two-dimensional electron gas in the van der Waals ferromagnet Cr2Ge2Te6

Probing Magnetism in Insulating Cr₂Ge₂Te₆ by Induced Anomalous Hall Effect in Pt

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Pressure-induced spin reorientation transition in layered ferromagnetic insulator Cr2Ge2Te6

Cited by 82 publications

References 23 publications

Magnetotransport as a diagnostic of spin reorientation: Kagome ferromagnet as a case study

Magnetotransport as a diagnostic of spin reorientation: Kagome ferromagnet as a case study

Magnetic anisotropy and spin-polarized two-dimensional electron gas in the van der Waals ferromagnet Cr2Ge2Te6

Probing Magnetism in Insulating Cr2Ge2Te6 by Induced Anomalous Hall Effect in Pt

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Probing Magnetism in Insulating Cr₂Ge₂Te₆ by Induced Anomalous Hall Effect in Pt