475 citations · 3.3k across the 51 of their papers we have counts for
34 papers · 1 filter
Electronic manipulation of polar order in electron crystal
Takashi Kikkawa, Ziyan Chen, Yuto Fujimoto +8
When interaction among atoms or ions is strong enough, they often arrange periodically, forming a crystal. The arrangement patterns of atoms or ions can encode information, a conce…
Giant orbital magnetoresistance in the antiferromagnet CoO driven by dynamic orbital angular momentum interaction
Christin Schmitt, Sachin Krishnia, Edgar Galindez-Ruales +12
Recent predictions of orders of magnitude larger orbital current effects compared to spin currents have attracted significant interest. However, the full potential of giant orbital…
Spin wave resonance in yttrium iron garnet stripe domains
Daniel Prestwood, Chris E. A. Barker, Kilian D. Stenning +15
We study a thin film yttrium iron garnet sample that exhibits magnetic stripe domains due to a small perpendicular magnetic anisotropy. Using wide-field magneto-optic Kerr effect m…
All optical excitation of spin polarization in d-wave altermagnets
Marius Weber, Stephan Wust, Luca Haag +14
The recently discovered altermagnets exhibit collinear magnetic order with zero net magnetization but with unconventional spin-polarized d/g/i-wave band structures, expanding the k…
Detecting bulk carbon ferromagnetism in graphene multi-edge structure
Chao Wang, Nan Jian, Meijie Yin +11
The emergence of bulk carbon ferromagnetism is long-expected over years. At nanoscale, carbon ferromagnetism was detected by analyzing the magnetic edge states via scanning tunneli…
Spin and spin current -- From fundamentals to recent progress
Sadamichi Maekawa, Takashi Kikkawa, Hiroyuki Chudo +2
Along with the progress of spin science and spintronics research, the flow of electron spins, (i.e. spin current), has attracted interest. New phenomena and electronic states were…
Composition-tunable magnon-polaron anomalies in spin Seebeck effects in epitaxial BiYFeO films
Takashi Kikkawa, Koichi Oyanagi, Tomosato Hioki +5
We have investigated hybridized magnon-phonon excitation (magnon polarons) in spin Seebeck effects (SSEs) in BiYFeO (BiYIG; , , and $…
Indirect optical manipulation of the antiferromagnetic order of insulating NiO by ultrafast interfacial energy transfer
Stephan Wust, Christopher Seibel, Hendrik Meer +14
We report the ultrafast, (sub)picosecond reduction of the antiferromagnetic order of the insulating NiO thin film in a Pt/NiO bilayer. This reduction of the antiferromagnetic order…
Spin Seebeck Effect: Sensitive Probe for Elementary Excitation, Spin Correlation, Transport, Magnetic Order, and Domains in Solids
Takashi Kikkawa, Eiji Saitoh
The spin Seebeck effect (SSE) refers to the generation of a spin current as a result of a temperature gradient in a magnetic material, which can be detected electrically via the in…
Observation of nuclear-spin Seebeck effect
T. Kikkawa, D. Reitz, H. Ito +10
Thermoelectric effects have been applied to power generators and temperature sensors that convert waste heat into electricity. The effects, however, have been limited to electrons…
Paramagnetic spin Hall magnetoresistance
Koichi Oyanagi, Juan M. Gomez-Perez, Xian-Peng Zhang +9
Spin Hall magnetoresistance (SMR) refers to a resistance change in a metallic film reflecting the magnetization direction of a magnet attached to the film. The mechanism of this ph…
Magnon polarons in the spin Peltier effect
Reimei Yahiro, Takashi Kikkawa, Rafael Ramos +4
We report the observation of anomalous peak structures induced by hybridized magnon-phonon excitation (magnon polarons) in the magnetic field dependence of the spin Peltier effect…
Magnetic field dependence of the nonlocal spin Seebeck effect in Pt/YIG/Pt systems at low temperatures
Koichi Oyanagi, Takashi Kikkawa, Eiji Saitoh
We report the nonlocal spin Seebeck effect (nlSSE) in a lateral configuration of Pt/YFeO(YIG)/Pt systems as a function of the magnetic field (up to 10 T) at vari…
Spin Seebeck effect in the layered ferromagnetic insulators CrSiTe and CrGeTe
Naohiro Ito, Takashi Kikkawa, Joseph Barker +3
We have studied the longitudinal spin Seebeck effect (LSSE) in the layered ferromagnetic insulators CrSiTe and CrGeTe covered by Pt films in the measurement configuration w…
Room temperature and low-field resonant enhancement of spin Seebeck effect in partially compensated magnets
R. Ramos, T. Hioki, Y. Hashimoto +7
Resonant enhancement of spin Seebeck effect (SSE) due to phonons was recently discovered in Y3Fe5O12 (YIG). This effect is explained by hybridization between the magnon and phonon…
Fabrication of yttrium-iron-garnet/Pt multilayers for the longitudinal spin Seebeck effect
Tatsuhiro Nozue, Takashi Kikkawa, Tomoki Watamura +4
For longitudinal spin Seebeck effect (LSSE) devices, a multilayer structure comprising ferromagnetic and nonmagnetic layers is expected to improve their thermoelectric power. In th…
Efficient spin transport in a paramagnetic insulator
Koichi Oyanagi, Saburo Takahashi, Ludo J. Cornelissen +6
The discovery of new materials that efficiently transmit spin currents has been important for spintronics and material science. The electric insulator $\mathrm{Gd}_3\mathrm{Ga}_5\m…
Interface-induced anomalous Nernst effect in Fe3O4/Pt-based heterostructures
R. Ramos, T. Kikkawa, A. Anadón +8
We have studied the anomalous Nernst effect (ANE) in [Fe3O4/Pt]-based heterostructures, by measuring the ANE-induced electric field with a magnetic field applied normal to the samp…
Antiferromagnetic anisotropy determination by spin Hall magnetoresistance
Hua Wang, Dazhi Hou, Zhiyong Qiu +3
An electric method for measuring magnetic anisotropy in antiferromagnetic insulators (AFIs) is proposed. When a metallic film with strong spin-orbit interactions, e.g., platinum (P…
Ferroic collinear multilayer magnon spin valve
Joel Cramer, Felix Fuhrmann, Ulrike Ritzmann +10
Information transport and processing by pure magnonic spin currents in insulators is a promising alternative to conventional charge-current driven spintronic devices. The absence o…
Detection of induced paramagnetic moments in Pt on YFeO via x-ray magnetic circular dichroism
Takashi Kikkawa, Motohiro Suzuki, Jun Okabayashi +4
Magnetic moments in an ultra-thin Pt film on a ferrimagnetic insulator YFeO (YIG) have been investigated at high magnetic fields and low temperatures by means of X-r…
Probing length-scale separation of thermal and spin currents by nanostructuring YIG
Asuka Miura, Takashi Kikkawa, Ryo Iguchi +3
We have fabricated bulk nanostructured ferrimagnetic materials with different grain sizes by sintering ball-milled Y3Fe5O12 (YIG) nanoparticles and measured the grain-size dependen…
Magnon Polarons in the Spin Seebeck Effect
Takashi Kikkawa, Ka Shen, Benedetta Flebus +5
Sharp structures in magnetic field-dependent spin Seebeck effect (SSE) voltages of Pt/YFeO (YIG) at low temperatures are attributed to the magnon-phonon interact…
Thermoelectric generation based on spin Seebeck effects
Ken-ichi Uchida, Hiroto Adachi, Takashi Kikkawa +5
The spin Seebeck effect (SSE) refers to the generation of a spin current as a result of a temperature gradient in magnetic materials including insulators. The SSE is applicable to…