NMR observation of the spin structure and field induced spin reorientation in YFeO3

Lütgemeier, H.; Böhn, H.; Brajczewska, Marta

doi:10.1016/0304-8853(80)90475-8

Cited by 40 publications

(33 citation statements)

References 9 publications

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“…Below the Néel temperature, T N ¼ 645 K, the YFeO 3 behaves as a canted antiferromagnet with macroscopic magnetization in the direction of the c-axis, and the nearest neighbor Fe 3þ ions are ordered in antiparallel along the a-axis of the orthorhombic crystal. 22 When a THz pulse is incident along the c-axis of the crystal, the magnetic field of the THz pulse can couple with the quasiferromagnetic mode at the frequency of 0.299 THz due to the magnetic dipole transition. 23 At the same time, the electric field of the THz wave can excite both ordinary and extraordinary polarization of the crystal, and birefringence occurs for the incident THz wave.…”

Section: Hudkhuw] Pdjqhwlf Ilhog Lqgxfhg Frkhuhqw Vslq Suhfhvvlrq Lqmentioning

confidence: 99%

“…It is well known that the birefringent refractive indices in the c-cut plane of YFeO 3 crystal are n a ¼ 4.80 and n b ¼ 4.57 in the THz frequency range, respectively. 22 When the electric field of the incident THz wave is neither parallel nor perpendicular to the a-axis of the crystal, the THz waves travel through the crystal in the form of both ordinary and extraordinary waves, and the two THz waves are split in the time domain after they leave the crystal due to the different refractive indices they experience. The dip around 0.43 THz in Fig.…”

Section: Hudkhuw] Pdjqhwlf Ilhog Lqgxfhg Frkhuhqw Vslq Suhfhvvlrq Lqmentioning

confidence: 99%

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Terahertz magnetic field induced coherent spin precession in YFeO3

Zhou¹,

Jin²,

Li³

et al. 2012

Applied Physics Letters

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We present the magnetic dipole transition at 0.299 THz excited by magnetic component of terahertz electromagnetic pulse in an antiferromagnetic YFeO3 crystal. The impulsive magnetic field of the terahertz pulse tilts the macroscopic magnetization, causing deviation from the equilibrium position, which is manifested by a sharp absorption at the frequency of the quasiferromagnetic mode of the crystal. The rotating coherent macroscopic magnetization radiates elliptically polarized emission at the frequency of the quasiferromagnetic resonance due to the dichroic absorption in the crystal.

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Section: Hudkhuw] Pdjqhwlf Ilhog Lqgxfhg Frkhuhqw Vslq Suhfhvvlrq Lqmentioning

confidence: 99%

Section: Hudkhuw] Pdjqhwlf Ilhog Lqgxfhg Frkhuhqw Vslq Suhfhvvlrq Lqmentioning

confidence: 99%

Terahertz magnetic field induced coherent spin precession in YFeO3

Zhou¹,

Jin²,

Li³

et al. 2012

Applied Physics Letters

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“…The ground state has canted AFM order [10,24] with a net magnetization M along the crystal c axis as shown in Fig. 1(a) [11,25,26] (for details see Fig.…”

mentioning

confidence: 99%

Coherent Two-Dimensional Terahertz Magnetic Resonance Spectroscopy of Collective Spin Waves

et al. 2017

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We report a demonstration of two-dimensional (2D) terahertz (THz) magnetic resonance spectroscopy using the magnetic fields of two time-delayed THz pulses. We apply the methodology to directly reveal the nonlinear responses of collective spin waves (magnons) in a canted antiferromagnetic crystal. The 2D THz spectra show all of the third-order nonlinear magnon signals including magnon spin echoes, and 2-quantum signals that reveal pairwise correlations between magnons at the Brillouin zone center. We also observe second-order nonlinear magnon signals showing resonance-enhanced second-harmonic and difference-frequency generation. Numerical simulations of the spin dynamics reproduce all of the spectral features in excellent agreement with the experimental 2D THz spectra. DOI: 10.1103/PhysRevLett.118.207204 Nonlinear manipulation of spins is the basis for all advanced methods in magnetic resonance including multidimensional nuclear magnetic resonance and electron spin resonance (ESR) spectroscopies [1,2], magnetic resonance imaging, and, in recent years, quantum control over individual spins [3]. The methodology is facilitated by the ease with which the regime of strong coupling can be reached between radio frequency or microwave magnetic fields and nuclear or electron spins, respectively, typified by sequences of magnetic pulses that control the magnetic moment directions [1][2][3]. The capabilities meet a bottleneck, however, for far-infrared magnetic resonances characteristic of correlated electron materials, molecular magnets, and metalloproteins.ESR in the terahertz (THz) frequency region can reveal rich information content in chemistry, biology, and materials science [1,2,[4][5][6][7]. In molecular complexes and metalloproteins, THz-frequency zero-field splittings (ZFS) of high-spin transition-metal and rare-earth ions show exquisite sensitivity to ligand geometries, providing mechanistic insight into molecular magnetic properties [4] and protein catalytic function [5]. With strong applied magnetic fields (∼10 T), resonances of unpaired electron spins in molecular complexes can be shifted from the usual microwave regime into the THz range, drastically improving the resolution due to enhanced spectral splittings [2,6,7]. In many ferromagnetic (FM) and antiferromagnetic (AFM) materials, intrinsic magnetic fields in the same range put collective spin waves (magnons) in the THz range. Current ESR spectroscopy remains limited at THz frequencies because the weak sources used only permit measurements of free-induction decay (FID) signals that are linearly proportional to the excitation magnetic field strength. In some cases, including most proteins, even linear THz-frequency ESR signals may not be measurable because the THz spectrum includes much stronger absorption features due to low-frequency motions of polar segments [8]. However, the fast dephasing of such motions ensures that they would not compete with nonlinear spin echo signals [9]. Two-dimensional (2D) THz ESR spectroscopy, like 2D ESR at lower frequenci...

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“…The samples used in this study are single crystals of yttrium orthoferrite YFeO 3 grown by the floating zone method. YFeO 3 is an antiferromagnet below the Néel temperature T N = 645 K [10], and nearest neighbors of Fe 3+ ions are ordered in antiparallel alignment along the a-axis of the orthorhombic crystal lattice [11]. YFeO 3 possesses macroscopic magnetization in the direction of the c-axis ascribed to canting of Fe 3+ ion magnetic moments, and have two branches of antiferromagnetic resonance in sub-THz frequency range.…”

Section: Methodsmentioning

confidence: 99%

Ultrafast Coherent Control of Spin Precession Motion by Terahertz Magnetic Pulses

2012

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We demonstrated coherent control of spin precession motion due to the ferromagnetic resonance induced by magnetic field component of ultrashort terahertz pulses. The amplitude of the precession can be controlled by the pulse separation time of the double pulse excitation technique. We succeeded in observing the energy transfer between spin and photon systems, and the energy of the spin system is returned to the second terahertz pulses instantaneously when the precession amplitude is cancelled.

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NMR observation of the spin structure and field induced spin reorientation in YFeO3

Cited by 40 publications

References 9 publications

Terahertz magnetic field induced coherent spin precession in YFeO3

Terahertz magnetic field induced coherent spin precession in YFeO3

Coherent Two-Dimensional Terahertz Magnetic Resonance Spectroscopy of Collective Spin Waves

Ultrafast Coherent Control of Spin Precession Motion by Terahertz Magnetic Pulses

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