Name

MOCHIZUKI, Masahito

Official Title

Professor

Affiliation

(School of Advanced Science and Engineering)

Sub-affiliation

Affiliated Institutes

ホリスティック物理学研究所

研究所員 2017-2019

理工学術院総合研究所(理工学研究所)

兼任研究員 2018-

ホリスティック物理学研究所

研究所員 2019-

Paper

Selective activation of an isolated magnetic skyrmion in a ferromagnet with microwave electric fields

A. Takeuchi, and M. Mochizuki

Appl. Phys. Lett. Peer Review Yes 113p.0724042018/09-

DOI

Spin model for nontrivial types of magnetic order in inverse-perovskite antiferromagnets

M. Mochizuki, M. Kobayashi, R. Okabe, and D. Yamamoto

Phys. Rev. B 97p.060401(R)2018/02-

DOI

Highly efficient induction of spin polarization by circularly polarized electromagnetic waves in the Rashba spin-orbit systems

M. Mochizuki, K. Ihara, J. Ohe, and A. Takeuchi

Appl. Phys. Lett. 112p.1224012018/03-

DOI

Formation process of skyrmion lattice domain boundaries: The role of grain boundaries

H. Nakajima, A. Kotani, M. Mochizuki, K. Harada, and S. Mori

Appl. Phys. Lett. 111p.1924012017/11-

DOI

Controlled creation of nanometric skyrmions using external magnetic fields

M. Mochizuki

Appl. Phys. Lett. 111p.924032017/08-

DOI

Theory of Magnetic-Field-Induced Polarization Flop in Spin-Spiral Multiferroics

Masahito Mochizuki

Phys. Rev. B 92p.2244122015/12-

DOI

Creation of Skyrmions by Electric Field on Chiral-Lattice Magnetic Insulators

Masahito Mochizuki

Advanced Electronic Materials 2p.15001802015/10-

DOI

Neel-type skyrmion lattice with confined orientation in the polar magnetic semiconductor GaV4S8

I. Kezsmarki, S. Bordács, P. Milde, E. Neuber, L. M. Eng, J. S. White, H. M. Ronnow, C. D. Dewhurst, M.Mochizuki, K. Yanai, H. Nakamura, D. Ehlers, V. Tsurkan, A. Loidl

Nature Materials 14p.1116 - 11222015/09-

DOI

Writing a skyrmion on multiferroic materials

M. Mochizuki and Y. Watanabe

Appl. Phys. Lett. 107p.824092015/08-

DOI

Magnetoelectric domain control in multiferroic TbMnO3

M. Matsubara, S. Manz, M. Mochizuki, T. Kubacka, A. Iyama, N. Aliouane, T. Kimura, S. Johnson, D. Meier, and M. Fiebig

Science 348p.1112 - 11152015/06-

DOI

Microwave Magnetochiral Effect in Cu2OSeO3

Masahito Mochizuki

Phys. Rev. Lett. 114p.1972032015/05-

DOI

Thermally driven ratchet motion of a skyrmion microcrystal and topological magnon Hall effect

M. Mochizuki, X. Z. Yu, S. Seki, N. Kanazawa, W. Koshibae, J. Zang, M. Mostovoy, Y. Tokura, N. Nagaosa

Nature Materials 13p.241 - 2462014/01-

DOI

Current-induced skyrmion dynamics in constricted geometries

J. Iwasaki, M. Mochizuki, and N. Nagaosa

Nature Nanotechnology 8p.742 - 7472013/09-

DOI

Microwave magnetoelectric effect via skyrmion resonance modes in a helimagnetic multiferroic

Y. Okamura, F. Kagawa, M. Mochizuki, M. Kubota, S. Seki, S. Ishiwata, M. Kawasaki, Y. Onose, Y. Tokura

Nature Communications 4p.33912013/08-

DOI

Magnetoelectric resonances and predicted microwave diode effect of the skyrmion crystal in a multiferroic chiral-lattice magnet

M. Mochizuki, and S. Seki

Phys. Rev. B 87p.1344032013/04-

DOI

Universal current-velocity relation of skyrmion motion in chiral magnets

J. Iwasaki, M. Mochizuki, and N. Nagaosa

Nature Communications 4p.14632013/02-

DOI

Hall Effect of Spin-Chirality Origin in a Triangular-Lattice Helimagnet Fe1.3Sb

Y. Shiomi, M. Mochizuki, Y. Kaneko, and Y. Tokura

Phys. Rev. Lett. 108p.566012012/02-

DOI

Origin of the Large Polarization in Multiferroic YMnO3 Thin Films Revealed by Soft- and Hard-X-Ray Diffraction

H. Wadati, J. Okamoto, M. Garganourakis, V. Scagnoli, U. Staub, Y. Yamasaki, H. Nakao, Y. Murakami, M. Mochizuki, M. Nakamura, M. Kawasaki, and Y. Tokura

Phys. Rev. Lett. 108p.472032012/01-

DOI

Spin-Wave Modes and Their Intense Excitation Effects in Skyrmion Crystals

M. Mochizuki

Phys. Rev. Lett. 108p.176012012/01-

DOI

Theory of spin-phonon coupling in multiferroic manganese perovskites RMnO3

M. Mochizuki, N. Furukawa and N. Nagaosa

Phys. Rev. B 84p.1444092011/10-

DOI

Magnetic Field Induced Dehybridization of the Electromagnons in Multiferroic TbMnO3

P. Rovillain, M. Cazayous, Y. Gallais, M-A. Measson, A. Sacuto, H. Sakata, and M. Mochizuki

Phys. Rev. Lett. 107p.272022011/07-

DOI

Theory of Magnetic Switching of Ferroelectricity in Spiral Magnets

M. Mochizuki and N. Furukawa

Phys. Rev. Lett. 105p.1876012010/10-

DOI

Theoretically Predicted Picosecond Optical Switching of Spin Chirality in Multiferroics

M. Mochizuki and N. Nagaosa

Phys. Rev. Lett. 105p.1472022010/10-

DOI

Spin Model of Magnetostrictions in Multiferroic Mn Perovskites

M. Mochizuki, N. Furukawa and N. Nagaosa

Phys. Rev. Lett. 105p.372052010/07-

DOI

Theory of Electromagnons in the Multiferroic Mn Perovskites: The Vital Role of Higher Harmonic Components of the Spiral Spin Order

M. Mochizuki, N. Furukawa and N. Nagaosa

Phys. Rev. Lett. 104p.1772062010/04-

DOI

Roles of Bond Alternation in Magnetic Phase Diagram of RMnO3

N. Furukawa and M. Mochizuki

J. Phys. Soc. Jpn. 79p.337082010/03-

DOI

Novel Multiferroic State of Eu1-xYxMnO3 in High Magnetic Fields

M. Tokunaga, Y. Yamasaki, Y. Onose, M. Mochizuki, N. Furukawa and Y. Tokura

Phys. Rev. Lett. 103p.1872022010/10-

DOI

Microscopic Model and Phase Diagrams of the Multiferroic Perovskite Manganites

M. Mochizuki and N. Furukawa

Phys. Rev. B 80p.1344162009/10-

DOI

Mechanism of Lattice-Distortion-Induced Electric-Polarization Flop in the Multiferroic Perovskite Manganites

M. Mochizuki and N. Furukawa

J. Phys. Soc. Jpn. 78p.537042009/05-

DOI

Dynamics of Multiferroic Domain Wall in Spin-Cycloidal Ferroelectric DyMnO3

F. Kagawa, M. Mochizuki, Y. Onose, H. Murakawa, Y. Kaneko, N. Furukawa and Y. Tokura

Phys. Rev. Lett. 102p.576042009/02-

DOI

Evidence for an Electric-Dipole Active Continuum Band of Spin Excitations in Multiferroic TbMnO3

Y. Takahashi, N. Kida, Y. Yamasaki, J. Fujioka, T. Arima, R. Shimano, S. Miyahara, M. Mochizuki, N. Furukawa and Y. Tokura

Phys. Rev. Lett. 101p.1872012008/10-

DOI

Precise Control of Band Filling in NaxCoO2

D. Yoshizumi, Y. Muraoka, Y. Okamoto, Y. Kiuchi, J. Yamaura, M. Mochizuki, M. Ogata and Z. Hiroi

J. Phys. Soc. Jpn. 76p.637052007/06-

DOI

Specific Heat and Superfluid Density for Possible Two Different Superconducting States in NaxCoO2・yH2O

M. Mochizuki, H. Q. Yuan and M. Ogata

J. Phys. Soc. Jpn. 76p.237022007/02-

DOI

CoO2-Layer-Thickness Dependence of Magnetic Properties and Possible Two Different Superconducting States in NaxCoO2・yH2O

M. Mochizuki and M. Ogata

J. Phys. Soc. Jpn. 76p.137042007/01-

DOI

Deformation of Electronic Structures Due to CoO6 Distortion and Phase Diagrams of NaxCoO2・yH2O

M. Mochizuki and M. Ogata

J. Phys. Soc. Jpn. 75p.1137032006/11-

DOI

Role of Spin-Orbit Coupling on the Spin Triplet Pairing in NaxCoO2・yH2O II: Multiple Phase Diagram under the Magnetic Field

Y. Yanase, M. Mochizuki and M. Ogata

J. Phys. Soc. Jpn. 74p.3351 - 33642005/10-

DOI

Role of Spin-Orbit Coupling on the Spin Triplet Pairing in NaxCoO2・yH2O I: d-Vector under Zero Magnetic Field

Y. Yanase, M. Mochizuki and M. Ogata

J. Phys. Soc. Jpn. 74p.2568 - 25782005/07-

DOI

Ferromagnetic and Triplet-Pairing Instabilities Controlled by Trigonal Distortion of CoO6 Octahedra in NaxCoO2・yH2O

M. Mochizuki, Y. Yanase and M. Ogata

J. Phys. Soc. Jpn. 74p.1670 - 16732005/03-

DOI

Multi-Orbital Analysis on the Superconductivity in NaxCoO2・yH2O

Y. Yanase, M. Mochizuki and M. Ogata

J. Phys. Soc. Jpn. 74p.430 - 4442005/01-

DOI

Ferromagnetic Fluctuation and Possible Triplet Superconductivity in NaxCoO2・yH2O: Fluctuation-Exchange Study of the Multiorbital Hubbard Model

M. Mochizuki, Y. Yanase and M. Ogata

Phys. Rev. Lett. 94p.1470052005/04-

DOI

G-Type Antiferromagnetism and Orbital Ordering Due to the Crystal Field from the Rare-Earth Ions Induced by the GdFeO3-Type Distortion in RTiO3 with R=La, Pr, Nd and Sm

M. Mochizuki and M. Imada

J. Phys. Soc. Jpn. 73p.1833 - 18502004/07-

DOI

Orbital-Spin Structure and Lattice Coupling in RTiO3 Where R=La, Pr, Nd and Sm

M. Mochizuki and M. Imada

Phys. Rev. Lett. 91p.1672032003/10-

DOI

Spin and Orbital States and Their Phase Transitions of the Perovskite-Type Ti Oxides: Weak Coupling Approach

M. Mochizuki

J. Phys. Soc. Jpn. 71p.2039 - 20472002/08-

DOI

Origin of G-Type Antiferromagnetism and Orbital-Spin Structures in LaTiO3

M. Mochizuki and M. Imada

J. Phys. Soc. Jpn. 70p.2872 - 28752001/10-

DOI

Magnetic and Orbital States and Their Phase Transition of the Perovskite-Type Ti Oxides: Strong Coupling Approach

M. Mochizuki and M. Imada

J. Phys. Soc. Jpn. 70p.1777 - 17892001/06-

DOI

Magnetic Phase Transition of the Perovskite-Type Ti Oxides

M. Mochizuki and M. Imada

J. Phys. Soc. Jpn. 69p.1982 - 19852000/06-

DOI

Books And Publication

Topological Structures in Ferroic Materials: Domain Walls, Skyrmions and Vortices

M. Mochizuki ・ edited by J. Seidel(Joint authorship)

Springer2016-

Detali

ISBN:978-3-319-25301-5

Skyrmions in Magnetic Materials

S. Seki, M. Mochizuki

Springer2016-

Detali

ISBN:978-3-319-24651-2

Research Grants & Projects

Grant-in-aids for Scientific Research Adoption Situation

Research Classification:

Theoretical study on intense-excitation effects and optical functions of electromagnons in multiferroic materials

2013/-0-2016/-0

Allocation Class:¥4420000

Research Classification:

Theoretical study of dynamical magnetoelectric phenomena in strongly correlated models

2013/-0-2016/-0

Allocation Class:¥9750000

Research Classification:

Thoretical Study on Quantum Domain Walls in Ferroelectrics

Allocation Class:¥4290000

Research Classification:

Theoretical study and materials search on gigantic negative thermal expansion phenomena in correlated electron systems

2019/-0-2021/-0

Allocation Class:¥6500000

Research Classification:

Metal-oxide spin-orbit electronics

2019/-0-2022/-0

Allocation Class:¥47190000

Research Classification:

Materials Design and Exploration of Functions for Strongly Correlated Materials - Challenges to Non-equilibrium and Non-Periodic Systems

2016/-0-2021/-0

Allocation Class:¥111020000

On-campus Research System

Special Research Project

トポロジカルナノ磁気テクスチャを情報担体とする高性能磁気メモリ素子の基盤技術の開発

2017

Research Results Outline:本研究課題では,近年,次世代磁気メモリ素子の情報担体として期待が集まっている「磁気スキルミオン」の動的応答現象を理論的に解明し,スキルミオン磁気メモリ本研究課題では,近年,次世代磁気メモリ素子の情報担体として期待が集まっている「磁気スキルミオン」の動的応答現象を理論的に解明し,スキルミオン磁気メモリ素子実現のための基盤技術を理論的に設計することを目的とする。磁気スキルミオンが発現するキラル磁性体...本研究課題では,近年,次世代磁気メモリ素子の情報担体として期待が集まっている「磁気スキルミオン」の動的応答現象を理論的に解明し,スキルミオン磁気メモリ素子実現のための基盤技術を理論的に設計することを目的とする。磁気スキルミオンが発現するキラル磁性体の微視的な数理モデルを構築し,有限温度における磁化の外場応答をシミュレーションするプログラムを完成させた。さらに,開発したコードを使い,従来は技術的に困難であると考えられていた数ナノメートルの極小スキルミオン構造を「磁場」によって書き込む技術を理論的に設計した。また,磁気スキルミオンと,そのドメイン構造の形成過程をシミュレーションにより明らかにした。

磁気スキルミオンのマイクロ波駆動とスピン起電力生成の理論設計

2018Collaborator:Maximilien Cazayous, 森茂生, 竹内祥人

Research Results Outline:キラル磁性体や磁気ヘテロ細線に発現する「スキルミオン」と呼ばれるトポロジカルナノ磁気構造をメモリ素子やマイクロ波素子に応用することを目指し、その特異なキラル磁性体や磁気ヘテロ細線に発現する「スキルミオン」と呼ばれるトポロジカルナノ磁気構造をメモリ素子やマイクロ波素子に応用することを目指し、その特異なマイクロ波誘起ダイナミクスやスピントロニクス機能について理論研究を進めた。磁気ヘテロ細線にマイクロ...キラル磁性体や磁気ヘテロ細線に発現する「スキルミオン」と呼ばれるトポロジカルナノ磁気構造をメモリ素子やマイクロ波素子に応用することを目指し、その特異なマイクロ波誘起ダイナミクスやスピントロニクス機能について理論研究を進めた。磁気ヘテロ細線にマイクロ波AC電場を印加しDzyaloshinskii-守谷相互作用を時間変調することでスキルミオンの並進運動が駆動できることを発見しApplied Physics Letters誌に発表した。また、傾斜定常磁場中の磁性体試料にマイクロ波磁場を印加し、スキルミオンのスピン波モードを励起することでスキルミオンの並進運動が駆動できることを発見しPhysical Review B誌に発表した。この成果は、効率的なマイクロ波-電圧変換の研究へと発展している。

Lecture Course

Course TitleSchoolYearTerm
Fundamental Physics A Kikan mirishuSchool of Fundamental Science and Engineering2019spring semester
Science and Engineering LaboratorySchool of Fundamental Science and Engineering2019fall semester
Science and Engineering Laboratory 1BSchool of Fundamental Science and Engineering2019fall semester
Science and Engineering Laboratory 1B VSchool of Fundamental Science and Engineering2019fall semester
Science and Engineering LaboratorySchool of Creative Science and Engineering2019fall semester
Science and Engineering Laboratory 1BSchool of Creative Science and Engineering2019fall semester
Science and Engineering Laboratory 1B VSchool of Creative Science and Engineering2019fall semester
Science and Engineering LaboratorySchool of Advanced Science and Engineering2019fall semester
Science and Engineering Laboratory 1BSchool of Advanced Science and Engineering2019fall semester
Science and Engineering Laboratory 1B VSchool of Advanced Science and Engineering2019fall semester
Introduction to PhysicsSchool of Advanced Science and Engineering2019spring semester
Introduction to PhysicsSchool of Advanced Science and Engineering2019spring semester
Introduction to Physics [S Grade]School of Advanced Science and Engineering2019spring semester
Introduction to Physics [S Grade]School of Advanced Science and Engineering2019spring semester
Physics of wave phenomenaSchool of Advanced Science and Engineering2019fall semester
Physics of wave phenomenaSchool of Advanced Science and Engineering2019fall semester
Physics of wave phenomena [S Grade]School of Advanced Science and Engineering2019fall semester
Physics of wave phenomena [S Grade]School of Advanced Science and Engineering2019fall semester
Electromagnetism ASchool of Advanced Science and Engineering2019spring semester
Electromagnetism ASchool of Advanced Science and Engineering2019spring semester
Electromagnetism A [S Grade]School of Advanced Science and Engineering2019spring semester
Electromagnetism A [S Grade]School of Advanced Science and Engineering2019spring semester
Applied Physics: Experiment BSchool of Advanced Science and Engineering2019full year
Physics: Experiment BSchool of Advanced Science and Engineering2019full year
Applied Physics: Experiment B [S Grade]School of Advanced Science and Engineering2019full year
Physics: Experiment B [S Grade]School of Advanced Science and Engineering2019full year
Graduation StudySchool of Advanced Science and Engineering2019full year
Graduation Study [S Grade]School of Advanced Science and Engineering2019full year
Graduation StudySchool of Advanced Science and Engineering2019full year
Graduation Study [S Grade]School of Advanced Science and Engineering2019full year
Graduation Thesis A (Physics)School of Advanced Science and Engineering2019fall semester
Graduation Thesis A (Physics) [S Grade]School of Advanced Science and Engineering2019fall semester
Graduation Thesis A (Applied Physics)School of Advanced Science and Engineering2019fall semester
Graduation Thesis A (Applied Physics) [S Grade]School of Advanced Science and Engineering2019fall semester
Graduation Thesis B (Physics)School of Advanced Science and Engineering2019spring semester
Graduation Thesis B (Physics) [S Grade]School of Advanced Science and Engineering2019spring semester
Graduation Thesis B (Applied Physics)School of Advanced Science and Engineering2019spring semester
Graduation Thesis B (Applied Physics) [S Grade]School of Advanced Science and Engineering2019spring semester
Current Topics in PhysicsSchool of Advanced Science and Engineering2019fall semester
Current Topics in PhysicsSchool of Advanced Science and Engineering2019fall semester
Current Topics in PhysicsSchool of Advanced Science and Engineering2019fall semester
Current Topics in Physics [S Grade]School of Advanced Science and Engineering2019fall semester
Master's Thesis (Department of Pure and Applied Physics)Graduate School of Advanced Science and Engineering2019full year
Research on Emergent Materials PhysicsGraduate School of Advanced Science and Engineering2019full year
Research on Emergent Materials PhysicsGraduate School of Advanced Science and Engineering2019full year
Quantum Physics of Matter AGraduate School of Advanced Science and Engineering2019spring semester
Quantum Physics of Matter AGraduate School of Advanced Science and Engineering2019spring semester
Seminar on Emergent Materials Physics AGraduate School of Advanced Science and Engineering2019spring semester
Seminar on Emergent Materials Physics AGraduate School of Advanced Science and Engineering2019spring semester
Seminar on Emergent Materials Physics BGraduate School of Advanced Science and Engineering2019fall semester
Seminar on Emergent Materials Physics BGraduate School of Advanced Science and Engineering2019fall semester
Master's Thesis (Department of Pure and Applied Physics)Graduate School of Advanced Science and Engineering2019full year
Research on emergent materials physicsGraduate School of Advanced Science and Engineering2019full year
Study Abroad in Physics and Applied Physics AGraduate School of Advanced Science and Engineering2019full year
Study Abroad in Physics and Applied Physics BGraduate School of Advanced Science and Engineering2019full year
Study Abroad in Physics and Applied Physics CGraduate School of Advanced Science and Engineering2019full year
Study Abroad in Physics and Applied Physics DGraduate School of Advanced Science and Engineering2019full year