Spin-flop transition in the easy-plane antiferromagnet nickel oxide

Machado, F.L.A.; Ribeiro, P. R. T.; Holanda, J.; Rodrı́guez-Suárez, R. L.; Azevedo, A.; Rezende, S. M.

doi:10.1103/physrevb.95.104418

Cited by 77 publications

(54 citation statements)

References 72 publications

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“…Our phenomenological model also shows that spin-flops accompany orbitalflops due to strong spin-orbit coupling. The spin-flops in CeSb is induced by rotating magnetic field and differs from the classic spin-flops widely observed in antiferromagnets [36,37,[45][46][47][48].…”

Section: Discussionmentioning

confidence: 67%

Orbital-flop Induced Magnetoresistance Anisotropy in Rare Earth Monopnictide CeSb

Bao

et al. 2019

Nat Commun

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The charge and spin of the electrons in solids have been extensively exploited in electronic devices and in the development of spintronics. Another attribute of electrons—their orbital nature—is attracting growing interest for understanding exotic phenomena and in creating the next-generation of quantum devices such as orbital qubits. Here, we report on orbital-flop induced magnetoresistance anisotropy in CeSb. In the low temperature high magnetic-field driven ferromagnetic state, a series of additional minima appear in the angle-dependent magnetoresistance. These minima arise from the anisotropic magnetization originating from orbital-flops and from the enhanced electron scattering from magnetic multidomains formed around the first-order orbital-flop transition. The measured magnetization anisotropy can be accounted for with a phenomenological model involving orbital-flops and a spin-valve-like structure is used to demonstrate the viable utilization of orbital-flop phenomenon. Our results showcase a contribution of orbital behavior in the emergence of intriguing phenomena.

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Section: Discussionmentioning

confidence: 67%

Orbital-flop Induced Magnetoresistance Anisotropy in Rare Earth Monopnictide CeSb

Bao

et al. 2019

Nat Commun

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“…1,2 In recent years, NiO attracted much attention as an antiferromagnetic (AF) insulator material for spintronic devices. [3][4][5][6][7][8][9][10][11] Understanding the spin-phonon coupling in NiO is a key to its functionalization and enabling AF spintronics' promise of ultra-high-speed and low-power dissipation. 12,13 The use of spin currents in spintronic devices instead of charge currents in electronic devices is advantageous for ultra-low energy dissipation.…”

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confidence: 99%

“…12,13 NiO occupies a special role among spintronic AF insulator materials. [4][5][6][7][8][9] Its high N eel temperature, T N ¼ 523 K, allows for device operation in the AF state at room temperature (RT) and above. The demonstrated coherent THz control of AF spin waves suggests a possibility of ultra-high speed operation of NiO spintronic devices.…”

mentioning

confidence: 99%

“…NiO has a two-sublattice AF crystalline structure consisting of FM aligned (111) planes that are AF aligned with respect to each other. 4,8,9 The AF ordering of NiO is due to the super-exchange interaction mediated by O orbitals. 33 Above T N , NiO has a face-centered cubic (FCC) structure with paramagnetic (PM) ordering, while below T N , the NiO lattice is characterized by a weak rhombohedral distortion.…”

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confidence: 99%

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Spin-phonon coupling in antiferromagnetic nickel oxide

Aytan

Debnath²,

Kargar

et al. 2017

Applied Physics Letters

126

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We report the results of ultraviolet Raman spectroscopy of NiO, which allowed us to determine the spin-phonon coupling coefficients in this important antiferromagnetic material. The use of the second-order phonon scattering and ultraviolet laser excitation (k ¼ 325 nm) was essential for overcoming the problem of the optical selection rules and dominance of the two-magnon band in the visible Raman spectrum of NiO. We established that the spins of Ni atoms interact more strongly with the longitudinal than transverse optical phonons and produce opposite effects on the phonon energies. The peculiarities of the spin-phonon coupling are consistent with the trends given by density functional theory. The obtained results shed light on the nature of the spin-phonon coupling in antiferromagnetic insulators and can help in developing spintronic devices.

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“…Note that ω α ω β and hence α (β) labels the upper (lower) mode. Whereas ω α increases with the magnetic field, ω β decreases and goes to zero at the onset of the spin-flop phase at ω H = ω SF ≈ 2ω E ω [57].…”

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confidence: 98%

Antiferromagnetic cavity optomagnonics

Parvini

Bittencourt

Kusminskiy

2020

Phys. Rev. Research

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Currently there is a growing interest in studying the coherent interaction between magnetic systems and electromagnetic radiation in a cavity, prompted partly by possible applications in hybrid quantum systems. We propose a multimode cavity optomagnonic system based on antiferromagnetic insulators, where optical photons couple coherently to the two homogeneous magnon modes of the antiferromagnet. These have frequencies typically in the THz range, a regime so far mostly unexplored in the realm of coherent interactions, and which makes antiferromagnets attractive for quantum transduction from THz to optical frequencies. We derive the theoretical model for the coupled system, and show that it presents unique characteristics. In particular, if the antiferromagnet presents hard-axis magnetic anisotropy, the optomagnonic coupling can be tuned by a magnetic field applied along the easy axis. This allows us to bring a selected magnon mode into and out of a dark mode, providing an alternative for a quantum memory protocol. The dynamical features of the driven system present unusual behavior due to optically induced magnon-magnon interactions, including regions of magnon heating for a red-detuned driving laser. The multimode character of the system is evident in a substructure of the optomagnonically induced transparency window.

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Spin-flop transition in the easy-plane antiferromagnet nickel oxide

Cited by 77 publications

References 72 publications

Orbital-flop Induced Magnetoresistance Anisotropy in Rare Earth Monopnictide CeSb

Orbital-flop Induced Magnetoresistance Anisotropy in Rare Earth Monopnictide CeSb

Spin-phonon coupling in antiferromagnetic nickel oxide

Antiferromagnetic cavity optomagnonics

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