Article
Materials Science, Multidisciplinary
Morten Amundsen, Irina V. Bobkova, Akashdeep Kamra
Summary: This theoretical study investigates nonlinear effects in magnonics, with a focus on superconductor-ferromagnet hybrids. The research demonstrates the magnonic spin Joule heating and provides insights into the thermal physics of nonconserved bosonic excitations. It also shows the tunability of spin and thermal conductances at the interface of a spin-split superconductor with a ferromagnetic insulator. Additionally, the study reveals hysteretic rectification characteristics resulting from the bistability of the superconducting state in this hybrid system.
Article
Physics, Multidisciplinary
D. R. Rodrigues, A. Salimath, K. Everschor-Sitte, K. M. D. Hals
Summary: This study successfully manipulates domain walls in kagome antiferromagnets via a spin-wave source, with the speed and direction of the domain wall motion regulated by tuning the spin wave frequency. By establishing an effective action and deriving equations for spin-wave-driven domain wall motion, the frequency-dependent velocity of the spin texture is explained.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
C. Schmitt, L. Sanchez-Tejerina, M. Filianina, F. Fuhrmann, H. Meer, R. Ramos, F. Maccherozzi, D. Backes, E. Saitoh, G. Finocchio, L. Baldrati, M. Klaeui
Summary: In this study, we demonstrate that arbitrary-shaped T domains can be generated in antiferromagnetic NiO/Pt bilayers through switching driven by electrical current pulses. The domain walls between the T domains have spins pointing towards the average direction of the two T domains, indicating the absence of strong Lifshitz invariants. The micromagnetic modeling suggests that the domain wall is formed by strain distributions in the NiO thin film induced by the MgO substrate.
Article
Engineering, Electrical & Electronic
Hugo Nicolas, Ricardo C. Sousa, Ariam Mora-Hernandez, Ioan-Lucian Prejbeanu, Luc Hebrard, Jean-Baptiste Kammerer, Joris Pascal
Summary: This article presents a new type of magnetic sensor using a perpendicular spin transfer torque magnetic tunnel junction (MTJ). The sensor has a cylindrical shape with a diameter of 50 nm, making it one of the smallest magnetic sensors reported. The article discusses the principle of operation, signal processing electronics, experimental results, and comparisons to existing magnetic sensors. The sensor demonstrates high sensitivity and dynamic range, and its compatibility with standard microelectronics components allows for integration with conditioning electronics.
IEEE SENSORS JOURNAL
(2023)
Article
Physics, Applied
Akhil K. Ramesh, Chih-Wei Cheng, Ting-Chia Ku, Vaibhav Rana, Pratisha Gangwar, Pushparaj Singh, Yuan-Chieh Tseng
Summary: This paper presents an approach to investigate the switching performance of spin transfer torque MRAM devices using an interface imperfection model. The study reveals the inverse relationship between switching time and interface imperfection. It also proposes a model that considers the roughness parameter in analyzing the damping of CoFeB/MgO films.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Applied
Xiangjun Xing, T. Wang, Yan Zhou
Summary: Traveling spin waves in magnonic waveguides undergo severe attenuation, but utilizing a ferromagnet/heavy metal bilayer can efficiently control the decay of spin waves, enriching the toolset for magnonic technologies.
APPLIED PHYSICS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Hugo Nicolas, Ricardo C. Sousa, Ariam Mora-Hernandez, Ioan-Lucian Prejbeanu, Luc Hebrard, Jean-Baptiste Kammerer, Joris Pascal
Summary: This article presents a new type of magnetic sensor using a perpendicular spin transfer torque magnetic tunnel junction (MTJ). The sensor has a cylindrical shape with a diameter of 50 nm, making it one of the smallest ever reported. The article describes the principle of operation, signal processing electronics, and compares its performance with commercially available sensors. The developed sensor has a sensitivity of 1.28 V/T, a dynamic range of 80 mT, and a noise level of 21.8 μT/√Hz. The sensor and its electronics are compatible with existing fabrication processes, allowing for mass production in various markets.
IEEE SENSORS JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Kazuaki Ishibashi, Satoshi Iihama, Shigemi Mizukami
Summary: A recent study reported a helicity-dependent photocurrent in Bi single-layer thin films. This photocurrent is believed to originate from the combination of photon-spin conversion and spin-charge conversion effects in Bi, with a high efficiency of spin conversion expected in Bi. In this study, two types of terahertz (THz) emissions from Bi/Co bilayer films were measured to investigate spin current induced by laser induced demagnetization of the Co layer and photon-spin conversion effect in the Bi layer simultaneously. The observed different thickness dependences of peak intensity and bandwidth for THz spin current in the two experiments are attributed to the distinct spin relaxation properties of optically excited spin currents in Bi layers.
Article
Chemistry, Multidisciplinary
Durgesh Kumar, Hong Jing Chung, JianPeng Chan, Tianli Jin, Sze Ter Lim, Stuart S. P. Parkin, Rachid Sbiaa, S. N. Piramanayagam
Summary: Neuromorphic computing is a potential technology for low power intelligent devices. Spintronics-based neurons and synapses have higher endurance. By engineering the beta-W spin-orbit coupling material, we achieved low energy domain wall motion. The energy consumption for moving the domain wall is 27 aJ/bit, showing the potential for ultralow energy spin-based neuromorphic elements.
Article
Chemistry, Multidisciplinary
Durgesh Kumar, Hong Jing Chung, JianPeng Chan, Tianli Jin, Sze Ter Lim, Stuart S. P. Parkin, Rachid Sbiaa, S. N. Piramanayagam
Summary: Neuromorphic computing is a potential technology for low-power intelligent devices. Spintronics-based neurons and synapses have higher endurance, but low-energy domain wall devices are preferred for low-power devices. By engineering the beta-W spin-orbit coupling material, we achieve low-current density DW motion with ultralow energy consumption and current density reduction.
Article
Engineering, Electrical & Electronic
Debashis Mondal, Arun Singh, Shubham Bhatt, Rahul Mishra
Summary: This study proposes a hybrid SOT-STT-based MRAM cell design that combines the favorable features of both the STT and the SOT devices, achieving high-density and energy-efficient nonvolatile spin memory.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Nanoscience & Nanotechnology
Apu Kumar Jana, S. Narayana Jammalamadaka
Summary: In this study, we propose that the spin transfer torque mechanism can be used to shift the magnetization loop along the magnetic field axis in an infinitely long ferromagnetic nanowire without an antiferromagnetic layer. We call this phenomenon spin transfer torque bias. The occurrence of spin transfer torque bias depends on the angle between the spin-polarized current and the Zeeman field, and is attributed to the helical motion of the domain wall.
Article
Materials Science, Multidisciplinary
Leandro Salemi, Peter M. Oppeneer
Summary: This study investigates the magnetic spin Hall effect (MSHE) in ferromagnetic materials Fe, Co, and Ni using ab initio calculations. The MSHE of Fe and Co is comparable to the conventional spin Hall effect (SHE), but the magnitude depends strongly on the electron lifetime and can have opposite signs. For Ni, the MSHE is smaller than the SHE, but still significant for spin-orbit torques. Additionally, the study explores the magnetic orbital Hall effect (MOHE) and thermal analogs of spin and orbital Nernst effects.
Article
Engineering, Electrical & Electronic
Hamdam Ghanatian, Hooman Farkhani, Yasser Rezaeiyan, Tim Bohnert, Ricardo Ferreira, Farshad Moradi
Summary: This article presents a 3-bit Flash spin-orbit torque analog-to-digital converter (SOT-ADC) that utilizes the spin Hall effect assisted by spin-transfer torque to switch a perpendicular-anisotropy magnetic tunnel junction. By utilizing heavy metal and fixed currents for sensing, the ADC eliminates the need for power-hungry comparators and reduces mismatch issues and chip area.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Chemistry, Analytical
Wenhan Chen, Haodi Tang, Yu Wang, Xianwu Hu, Yuming Lin, Tai Min, Yufeng Xie
Summary: By utilizing an electrically-controlled magnetic tunnel junction, a novel type of Ising spin is proposed, which shows superiority in constructing large-scale Ising annealing system and solving combinatorial optimization problems.
Article
Physics, Applied
Dae-Yun Kim, Min-Ho Park, Yong-Keun Park, Ji-Sung Yu, Joo-Sung Kim, Duck-Ho Kim, Byoung-Chul Min, Sug-Bong Choe
APPLIED PHYSICS LETTERS
(2018)
Article
Physics, Applied
Joo-Sung Kim, Yong-Keun Park, Hyun-Seok Whang, Jung-Hyun Park, Byoung-Chul Min, Sug-Bong Choe
APPLIED PHYSICS LETTERS
(2019)
Article
Engineering, Electrical & Electronic
Hee Sung Lee, Seung Hun Kim, Tae Hwan Jang, Hee-Gyum Park, Byoung-Chul Min, Seung-Young Park, Chul Soon Park
IEEE TRANSACTIONS ON MAGNETICS
(2019)
Article
Multidisciplinary Sciences
Daeseong Choe, Mi-Jin Jin, Shin-Ik Kim, Hyung-Jin Choi, Junhyeon Jo, Inseon Oh, Jungmin Park, Hosub Jin, Hyun Cheol Koo, Byoung-Chul Min, Seokmin Hong, Hyun-Woo Lee, Seung-Hyub Baek, Jung-Woo Yoo
NATURE COMMUNICATIONS
(2019)
Article
Materials Science, Multidisciplinary
Eun-Sang Park, Byoung-Chul Min, Hyun Cheol Koo, Kyoung-Whan Kim, Kyung-Jin Lee
CURRENT APPLIED PHYSICS
(2019)
Article
Multidisciplinary Sciences
Gyung-Min Choi, Jung Hyun Oh, Dong-Kyu Lee, Seo-Won Lee, Kun Woo Kim, Mijin Lim, Byoung-Chul Min, Kyung-Jin Lee, Hyun-Woo Lee
NATURE COMMUNICATIONS
(2020)
Article
Materials Science, Multidisciplinary
Yong-Keun Park, Joo-Sung Kim, Yune-Seok Nam, Seyyoung Jeon, Jung-Hyun Park, Kyoung-Whan Kim, Hyun-Woo Lee, Byoung-Chul Min, Sug-Bong Choe
NPG ASIA MATERIALS
(2020)
Article
Materials Science, Multidisciplinary
Hee Young Kwon, Kyung Mee Song, Juyoung Jeong, Ah-Yeon Lee, Seung-Young Park, Jeehoon Kim, Changyeon Won, Byoung-Chul Min, Hye Jung Chang, Jun Woo Choi
NPG ASIA MATERIALS
(2020)
Article
Multidisciplinary Sciences
Inseon Oh, Jungmin Park, Daeseong Choe, Junhyeon Jo, Hyeonjung Jeong, Mi-Jin Jin, Younghun Jo, Joonki Suh, Byoung-Chul Min, Jung-Woo Yoo
Summary: The molecule-based magnetic film for spin thermoelectric applications offers various synthetic routes, weak spin-lattice interaction, and low thermal conductivity, enabling effective energy harvesting from waste heat. By electrochemically depositing thin films on chromium electrodes at room temperature and demonstrating extremely low heat loss, this new class of magnet paves the way for sustainable recycling of ubiquitous waste heat.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Eun-Sang Park, Byoung-Chul Min, Hyun Cheol Koo, Kyoung-Whan Kim, Kyung-Jin Lee
Summary: This study theoretically investigates the spin-orbit torque on a ferromagnet within a ferromagnet(1)/normal metal/ferromagnet(2) trilayer, analyzing the effects caused by the spin Hall and spin swapping of ferromagnet(1). The results provide an analytical expression of the spin-orbit torque in trilayers, which may be valuable for quantifying the spin Hall and spin swapping effects of ferromagnets, and for interpreting SOT experiments using ferromagnets as spin current sources.
CURRENT APPLIED PHYSICS
(2021)
Article
Physics, Multidisciplinary
Hee-Gyum Park, Deok Hyun Yun, Won Min Jeong, OukJae Lee, Byoung-Chul Min
Summary: The study experimentally investigated the oscillatory interlayer exchange coupling (IEC) strength in synthetic antiferromagnets with various Ir/(Ru, Mo or W)/Ir composite spacers. It was found that the Ir insertion layer not only affects the magnitude of IEC but also the peak position in perpendicular synthetic antiferromagnets. The thickness dependence of composite spacers offers a possibility to tune both J(ex) and spacer thickness for SAF-based spintronic applications.
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2021)
Article
Physics, Applied
Yune-Seok Nam, Dae-Yun Kim, Yong-Keun Park, Ji-Sung Yu, Seong-Hyub Lee, Duck-Ho Kim, Byoung-Chul Min, Sug-Bong Choe
Summary: Here, researchers propose an experimental scheme to determine the strength of the Heisenberg exchange interaction in ultrathin magnetic films. The scheme analyzes the chirality transition between different types of domain walls under an in-plane magnetic field and estimates the exchange stiffness constant based on this analysis. The scheme, which utilizes the magneto-optical Kerr effect, is applicable to ultrathin magnetic films down to a few atomic layers.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Deok Hyun Yun, TaeHyuk Kwon, Ki-Hyuk Han, Dong Joon Lee, Seokmin Hong, Hyun Cheol Koo, Byoung-Chul Min, Byeong-Kwon Ju, OukJae Lee
Summary: In this study, the magnetic properties of Pt/CoFeB/MgO layers were investigated using the angle-resolved spin-torque ferromagnetic resonance method. The measurements provided reasonable magnetic parameters, but an unusual value was obtained for the interfacial spin transparency. The thickness dependence of the Lande g-factor for CoFeB indicated that the interfacial spin-orbit coupling played a role in determining the enhancement of magnetic damping. Furthermore, the azimuthal asymmetry in the magnetic system may not be related to unconventional spin polarization. These results contribute to the understanding of various magnetic properties and current-induced spin-torques in heavy-metal/ferromagnet bilayers.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Ji-Sung Yu, Dae-Yun Kim, Joon Moon, Seong-Hyub Lee, Jun-Young Chang, Duck-Ho Kim, Byoung-Chul Min, Sug-Bong Choe
Summary: Dzyaloshinskii-Moriya interaction (DMI) plays a crucial role in the formation and stability of chiral magnetic objects and also determines their roughness. Experimental observations on magnetic multilayer films reveal the relationship between DMI and the roughness of chiral domain-walls. This study provides a quantitative method to determine the DMI-induced effective field, which is an important parameter for the stability and dynamic characteristics of chiral domain-walls.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Dae-Yun Kim, Min-Ho Park, Yong-Keun Park, Joo-Sung Kim, Yune-Seok Nam, Duck-Ho Kim, Soong-Geun Je, Hyeok-Cheol Choi, Byoung-Chul Min, Sug-Bong Choe
NPG ASIA MATERIALS
(2018)