Article
Materials Science, Multidisciplinary
I. Fita, R. Puzniak, E. E. Zubov, P. Iwanowski, A. Wisniewski
Summary: The compensated ferrimagnet orthoferrite ErFeO3 exhibits temperature-driven spin switching and exchange bias, which is manifested as the temperature shift of the hysteresis loops upon cooling and heating. The unidirectional exchange bias anisotropy is caused by the shift in the region of coexistence of negative and positive magnetization, determined by the applied magnetic field. This phenomenon is discussed within a model that explains the magnetic compensation mechanism in ErFeO3.
Article
Chemistry, Physical
Xiaoxuan Ma, Wencheng Fan, Gang Zhao, Haiyang Chen, Chuankun Wang, Baojuan Kang, Zhenjie Feng, Jun-Yi Ge, Wei Ren, Shixun Cao
Summary: The magnetic behavior of a rare-earth orthoferrite ErFeO3 single crystal can be controlled by low magnetic fields, with two types of spin switching observed below the spin reorientation transition temperature. The applied magnetic fields can regulate the spin switching along the a-axis of the single crystal, while understanding the magnetic reversal effects can help explore potential applications in information devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Wanting Yang, Xiong Luo, Xiaoxuan Ma, Shuang Zhu, Huan Song, Zhiqiang Sun, Baojuan Kang, Zhenjie Feng, Shixun Cao, Jin-Ke Bao
Summary: Yb0.25Tb0.75FeO3 shows exceptional magnetic and magnetocaloric properties due to its unique chemical composition. It exhibits higher spin switching temperature and multiple spin switching effects, making it a promising candidate for magnetic sensing and refrigeration devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Condensed Matter
Xiong Luo, Rubin Li, Xiaoxuan Ma, Yunke Chen, Baojuan Kang, Jincang Zhang, Wei Ren, Zhenjie Feng, Shixun Cao
Summary: The detailed analysis of magnetic properties in Pr1- xSmxFeO3 single crystals reveals a butterfly-shaped spin switching phenomenon and a complex competition between Pr3+- Fe3+ and Sm3+-Fe3+ exchange interactions. In Pr0.6Sm0.4FeO3 single crystal, an incomplete spin reorientation transition and a type-I spin switching are observed, with additional presence of a type-II spin switching at 23K. This research offers insights for designing spintronic device materials in the future.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Materials Science, Ceramics
Xinxi Zeng, Han Zhang, Xiaoqing Xi, Bingcheng Luo, Pengfei Zhu, Guowu Li, Bo Li, Ji Zhou
Summary: A method of tuning absorption of terahertz dielectric ceramics through spin-reorientation transitions is presented. The study reveals the significant role of spin-reorientation transitions in adjusting the absorption properties and expands the functionality of magnetic orthoferrites for terahertz applications.
CERAMICS INTERNATIONAL
(2022)
Article
Physics, Fluids & Plasmas
Makoto Nakajima, Goro Isoyama, Takayuki Kurihara
Summary: The control of magnetic domain in ErFeO3 single crystal, a weak ferromagnet, is demonstrated using high-intensity terahertz (THz) pulse excitation. The THz pulses induce magnetic domain inversion by causing a combination of depinning of the magnetic domain due to local heating and the entropic force owing to the thermal gradient. The experiments were conducted at room temperature and around the spin reorientation phase transition.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Nestor E. Massa, Leire del Campo, Vinh Ta Phuoc, Paula Kayser, Jose Antonio Alonso
Summary: This study investigates the zone center terahertz excitations of non-Jahn Teller distorted perovskites LaFeO3, PrFeO3, ErFeO3, and LuFeO3 under external magnetic fields. The results show that the low-energy excitations strongly depend on the size of the lanthanide ions and are affected by minute lattice displacements. This study provides insights into the mechanism and manipulation of magnetic states using phonons in these perovskites.
Article
Physics, Multidisciplinary
Patrick Vorndamme, Heinz-Jurgen Schmidt, Christian Schroder, Jurgen Schnack
Summary: The study observed that in closed quantum systems, both integrable and non-integrable spin rings with various types of spin interactions can synchronize the directions of spin expectation values, which differs from synchronization in quantum dissipative systems. Although the phenomenon is not fully understood, it remains robust against random fluctuations of Heisenberg couplings and inhomogeneous magnetic fields.
NEW JOURNAL OF PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Man Zhang, Hangfeng Zhang, Qinghui Jiang, Feng Gao, Riqing Chen, Dou Zhang, Michael John Reece, Bin Yang, Giuseppe Viola, Haixue Yan
Summary: This article discusses the recent progress in the terahertz characterization of linear and nonlinear dielectrics for various electrical applications. The studies show that THz characterization can improve dielectric properties, enhance energy storage efficiency in capacitors, and aid in the development of new memory devices based on nondestructive reading operations using a THz beam.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Condensed Matter
Clemens Ritter, Monica Ceretti, Werner Paulus
Summary: High resolution and high intensity neutron powder diffraction were used to study the crystallographic and magnetic structure of orthoferrite CeFeO3 at different temperatures. The temperature-dependent magnetic couplings of the Fe-sublattice were identified, including a spin reorientation at 228 K and the appearance of faint magnetic peaks below 35 K attributed to the Ce-sublattice. The ground state magnetic structure of the Fe-sublattice in CeFeO3 is similar to that of DyFeO3, with an orthorhombic structure maintained throughout the temperature range.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Instruments & Instrumentation
Ning Wang, Guofeng Zhu, Zhiqiang Hu, Xuewei Ju, Haobin Su, Feng Huang, Qi Chen, Yiming Cao, Xiangfeng Wang
Summary: In this study, time-domain terahertz magneto-optical spectroscopy was used to investigate spin resonance in a c-cut TmFeO3 single crystal. The behavior of the crystal under different magnetic fields was characterized. By selectively exciting magnetic resonance modes, it was found that the quasi-ferromagnetic mode of the crystal shifted towards higher frequencies as the magnetic field increased, while the quasi-antiferromagnetic mode transformed into the quasi-ferromagnetic mode at low critical magnetic fields.
INFRARED PHYSICS & TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Takayuki Kurihara, Motoaki Bamba, Hiroshi Watanabe, Makoto Nakajima, Tohru Suemoto
Summary: Intense terahertz pulses can drive correlated spin systems up to the nonlinear regime, but the detection of such nonlinear spin dynamics is often hindered by small signal amplitudes and linear background components. Here, we demonstrate the use of the magnetooptical effect to efficiently extract the nonlinear signals in orthoferrite YFeO3. The observed waveforms contain quasiferromagnetic-mode magnon oscillation and its second harmonics, which can be explained by the dielectric function derived from the magnetorefractive Hamiltonian. Our results reveal the microscopically origin of the strong second harmonic signal from the dynamics of the quasi-ferromagnetic mode magnon in the nonlinear regime.
COMMUNICATIONS PHYSICS
(2023)
Article
Physics, Applied
Jiawang Xu, Zhan Wang, Zhuolin Li, Yang Gao, Chaoqun Hu, Dingsong Wang, Jingyan Zhang, Xinqi Zheng, Jianwang Cai, Tongyun Zhao, Shouguo Wang, Ying Zhang, Baogen Shen
Summary: Exploring and discovering various types of skyrmions has enriched the study of spintronics and its application in high-density magnetic information storage. The interactions between 4f and 3d electrons in rare-earth-transition metal magnets have led to the discovery of exotic magnetic domain configurations. Manipulating the magnetic anisotropy has allowed for the generation of field-free biskyrmions and tunable spin texture transformation, expanding the understanding of manipulating ferrimagnetic order and generating topological spin structures in rare-earth magnets.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Optics
E. N. Chesnokov, V. V. Kubarev, P. Koshlyakov
Summary: The effect of external longitudinal magnetic field on the optical free induction decay (FID) of the hydroxyl radical was investigated. Nonmonotonic rotation of FID polarization plane in a magnetic field was experimentally discovered. Numerical simulation of FID of the hydroxyl radical in a magnetic field was carried out.
LASER PHYSICS LETTERS
(2021)
Article
Physics, Condensed Matter
Kirill B. Tsiberkin
Summary: This study investigates the analytical and numerical modeling of the observable magnetization response in a regular diluted spin system. The size distribution of spin clusters has a significant impact on the total magnetization. When the clusters have similar sizes, the transversal magnetization follows an oscillating Abragam trial function. However, a large dispersion in cluster sizes leads to a monotonous decay of the signal envelope. The analytical estimates and numerical simulations of the spin ensemble are consistent.
EUROPEAN PHYSICAL JOURNAL B
(2023)
Article
Physics, Applied
Masato Ota, Koichi Kan, Soichiro Komada, Yasunobu Arikawa, Tomoki Shimizu, Valynn Katrine Mag-usara, Youichi Sakawa, Tatsunosuke Matsui, Makoto Nakajima
Summary: In this study, electro-optic (EO) sampling was used to measure the electric field profiles generated by a relativistic electron bunch in both longitudinal and transverse directions. By adjusting the time delay and shifting the electron bunch path, the longitudinal and transverse profiles were successfully obtained, showing good agreement with particle-in-cell calculations. This promising method allows for the simultaneous measurement of longitudinal and transverse beam sizes using the detected spatio-temporal electric field distribution.
APPLIED PHYSICS EXPRESS
(2021)
Article
Physics, Applied
Verdad C. Agulto, Kazuhiro Toya, Thanh Nhat Khoa Phan, Valynn Katrine Mag-usara, Jiajun Li, Melvin John F. Empizo, Toshiyuki Iwamoto, Ken Goto, Hisashi Murakami, Yoshinao Kumagai, Nobuhiko Sarukura, Masashi Yoshimura, Makoto Nakajima
Summary: By utilizing terahertz time-domain spectroscopy (THz-TDS), the properties of Homoepitaxial film and semi-insulating bulk beta-Ga2O3 with (001) orientation were studied. The noninvasive and contact-free evaluation through THz-TDS proved to be a powerful tool for probing and obtaining information about beta-Ga2O3 materials, aiding in the development of beta-Ga2O3-based device applications.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Miezel Talara, Dmitry S. Bulgarevich, Chiyaka Tachioka, Valynn Katrine Mag-usara, Joselito Muldera, Takashi Furuya, Hideaki Kitahara, Mary Clare Escano, Qixin Guo, Makoto Nakajima, Garik Torosyan, Rene Beigang, Makoto Watanabe, Masahiko Tani
Summary: Efficient terahertz (THz) wave generation was achieved using Fe/Pt diabolo-shaped spintronic antennas with different Pt thicknesses, resulting in significant emission amplitude improvements. The enhancement is attributed to improved THz radiation outcoupling to free space and to enhanced THz emission with thicker Pt deposition in the displacement current direction. Proper design of these THz emitters can lead to efficient spintronic radiation sources.
APPLIED PHYSICS EXPRESS
(2021)
Article
Chemistry, Physical
Hozumi Takahashi, Mayu Yamaji, Jun Ikeyama, Makoto Nakajima, Hideaki Kitahara, Syouei Tetsukawa, Naritaka Kobayashi, Mihoko Maruyama, Teruki Sugiyama, Shuji Okada, Yusuke Mori, Seiichiro Nakabayashi, Masashi Yoshimura, Hiroshi Y. Yoshikawa
Summary: The study found that femtosecond laser ablation has an impact on the shape and nonlinear optical properties of organic crystals. Ablation can generate new crystal steps on the surface, but does not deteriorate the nonlinear optical properties. Controlling crystal shape through damage-less ablation process may potentially enhance the nonlinear optical properties of organic crystals.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Physics, Applied
Yusuke Arashida, Takayuki Suzuki, Shuhei Nara, Ikufumi Katayama, Yasuo Minami, Satoshi Shindo, Yuji Sutou, Toshiharu Saiki, Jun Takeda
Summary: GCT has advantages such as high thermal stability and small volume change. The study shows that the timescale of amorphization dynamics in GCT is about 2 ps, and can be discussed by comparing it with Ge2Sb2Te5.
APPLIED PHYSICS LETTERS
(2021)
Article
Optics
Ayato Iba, Calvin W. Domier, Makoto Ikeda, Atsushi Mase, Makoto Nakajima, Anh-Vu Pham, Neville C. Luhmann
Summary: The super-oscillatory lens described in the letter has been experimentally and theoretically investigated, demonstrating high spatial resolution and depth of focus, making it suitable for industrial inspections.
Article
Physics, Multidisciplinary
Gabriel Fitzky, Makoto Nakajima, Yohei Koike, Alfred Leitenstorfer, Takayuki Kurihara
Summary: We investigated the ultrafast dynamics of spin reorientation transition in orthoferrite Sm0.7Er0.3FeO3 under different pumping mechanisms. There is a finite time delay for spin reorientation with phonon pumping, while an instantaneous response is found for resonant f-f excitation. This suggests that 4f electronic pumping can directly alter magnetic anisotropy at femtosecond timescales.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Verdad C. Agulto, Toshiyuki Iwamoto, Hideaki Kitahara, Kazuhiro Toya, Valynn Katrine Mag-usara, Masayuki Imanishi, Yusuke Mori, Masashi Yoshimura, Makoto Nakajima
Summary: The study focuses on nondestructive characterization of GaN single crystals with different carrier densities using THz time-domain ellipsometry. By analyzing multiple waveforms and correcting them, a ten times higher precision in determining carrier density and mobility parameters is achieved compared to merely measuring the polarization components.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Inhee Maeng, Hiroshi Tanaka, Valynn Katrine Mag-usara, Makoto Nakajima, Masakazu Nakamura, Min-Cherl Jung
Summary: This study verified the possibility of changing terahertz absorption frequency through the mixture of metal cations (Sn+ and Pb+) and halogen anions (Br- and I-).
FRONTIERS IN CHEMISTRY
(2021)
Article
Physics, Fluids & Plasmas
Makoto Nakajima, Goro Isoyama, Takayuki Kurihara
Summary: The control of magnetic domain in ErFeO3 single crystal, a weak ferromagnet, is demonstrated using high-intensity terahertz (THz) pulse excitation. The THz pulses induce magnetic domain inversion by causing a combination of depinning of the magnetic domain due to local heating and the entropic force owing to the thermal gradient. The experiments were conducted at room temperature and around the spin reorientation phase transition.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2021)
Article
Physics, Multidisciplinary
Thomas Deckert, Jonas Allerbeck, Takayuki Kurihara, Daniele Brida
Summary: Energetic correlations and dynamics play a crucial role in the fundamental properties of condensed matter materials. Ultrafast multidimensional spectroscopy in the mid infrared is an advanced technique used to study coherent low-energy dynamics. However, the intrinsic many-body phenomena in functional solid-state materials, especially few-layer samples, have not been extensively explored due to the complex and weak sample responses that require versatile and sensitive detection.
NEW JOURNAL OF PHYSICS
(2022)
Article
Optics
Christoph Schoenfeld, Philipp Sulzer, Daniele Brida, Alfred Leitenstorfer, Takayuki Kurihara
Summary: This study demonstrates a single-cycle light source in the near infrared for sensitive applications of ultrafast optical field control of electronic transport. The compact Er:fiber system generates passively phase-locked pulses with broad-band spectra, covering a wide range of frequencies. An electro-optic modulator is also equipped to switch the arrival time of the pulses, allowing timing modulation without changing the average intensity.
Proceedings Paper
Engineering, Electrical & Electronic
Fumiyoshi Kuwashima, Mona Jarrahi, Semih Cakmakyapan, Osamu Morikawa, Takuya Shirao, Kazuyuki Iwao, Kazuyoshi Kurihara, Hideaki Kitahara, Takashi Furuya, Kenji Wada, Makoto Nakajima, Masahiko Tani
Summary: The stability of optical beats in chaotically oscillating lasers was verified through comparison with free-running continuous-wave lasers using a highly efficient plasmonic photomixer (Antenna). The experiment demonstrated the high stability of optical beats in chaotically oscillating lasers.
TERAHERTZ, RF, MILLIMETER, AND SUBMILLIMETER-WAVE TECHNOLOGY AND APPLICATIONS XIV
(2021)
