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Journal Articles

Crystal structure and magnetism of MnO under pressure

Klotz, S.*; Komatsu, Kazuki*; Polian, A.*; Machida, Shinichi*; Sano, Asami; Iti$'e$, J.-P.*; Hattori, Takanori

Physical Review B, 101(6), p.064105_1 - 064105_6, 2020/02

 Times Cited Count:0 Percentile:100(Materials Science, Multidisciplinary)

Manganese oxide (MnO) is a prototype of an antiferromagnetic Mott-insulator. Here we investigate the interplay of magnetic ordering and lattice distortion across the N$'e$el temperature $$T_{N}$$ under pressure using neutron and X-ray diffraction. We find an increase of $$T_{N}$$ with a rate of $$T_{N}/dP$$ = +4.5(5) K/GPa, an increase of the rhombohedral distortion $$alpha$$ by $$dalpha/dP$$ = +0.018$$^{circ}$$/GPa, as well as a volume striction which is insensitive to pressure. These results allow to retrieve the dependence of the coupling constants $$J_{1}$$ and $$J_{2}$$ on interatomic distances and compare it to first-principles predictions. Antiferromagnetic diffuse scattering was observed up to $$sim$$1.2 $$T_{N}$$, and long-range magnetic order appears at room temperature at 42 GPa.

Journal Articles

Effects of Fe doping on anomalous specific heat and XAFS oscillation in antiferromagnetic metal Mn$$_3$$Si

Hiraka, Haruhiro*; Oyama, Kenji*; Kosaka, Masashi*; Matsumura, Daiju

AIP Advances (Internet), 8(10), p.101424_1 - 101424_5, 2018/10

 Times Cited Count:0 Percentile:100(Nanoscience & Nanotechnology)

Journal Articles

Spin torques and electrical voltage generation in antiferromagnetic nanotextures

Yamane, Yuta*; Ieda, Junichi

Magune, 13(5), p.235 - 241, 2018/10

Journal Articles

Magnetic anisotropy by Rashba spin-orbit coupling in antiferromagnetic thin films

Ieda, Junichi; Barnes, S. E.*; Maekawa, Sadamichi

Journal of the Physical Society of Japan, 87(5), p.053703_1 - 053703_4, 2018/05

 Times Cited Count:1 Percentile:74.05(Physics, Multidisciplinary)

Journal Articles

Mn$$_{2}$$VAl Heusler alloy thin films; Appearance of antiferromagnetism and exchange bias in a layered structure with Fe

Tsuchiya, Tomoki*; Kobayashi, Ryota*; Kubota, Takahide*; Saito, Kotaro*; Ono, Kanta*; Ohara, Takashi; Nakao, Akiko*; Takanashi, Koki*

Journal of Physics D; Applied Physics, 51(6), p.065001_1 - 065001_7, 2018/02

 Times Cited Count:2 Percentile:70.63(Physics, Applied)

Journal Articles

Structure of the magnetic excitations in the spin-1/2 triangular-lattice Heisenberg antiferromagnet Ba$$_{3}$$CoSb$$_{2}$$O$$_{9}$$

Ito, Saya*; Kurita, Nubuyuki*; Tanaka, Hidekazu*; Kawamura, Seiko; Nakajima, Kenji; Ito, Shinichi*; Kuwahara, Keitaro*; Kakurai, Kazuhisa*

Nature Communications (Internet), 8, p.235_1 - 235_6, 2017/08

 Times Cited Count:28 Percentile:6.43(Multidisciplinary Sciences)

Journal Articles

Magnetoresistance and Hall effect of antiferromagnetic uranium compound URhIn$$_5$$

Haga, Yoshinori; Matsumoto, Yuji*; Pospisil, J.; Tateiwa, Naoyuki; Yamamoto, Etsuji; Yamamura, Tomoo*; Fisk, Z.*

Journal of Physics; Conference Series, 807(1), p.012015_1 - 012015_4, 2017/04

 Times Cited Count:1 Percentile:46.67

Journal Articles

Tunable sign change of spin hall magnetoresistance in Pt/NiO/YIG structures

Hou, D.*; Qiu, Z.*; Barker, J.*; Sato, Koji*; Yamamoto, Kei; V$'e$lez, S.*; Gomez-Perez, J. M.*; Hueso, L. E.*; Casanova, F.*; Saito, Eiji

Physical Review Letters, 118(14), p.147202_1 - 147202_6, 2017/04

 Times Cited Count:65 Percentile:1.56(Physics, Multidisciplinary)

Journal Articles

Spin-transfer torques in antiferromagnetic textures; Efficiency and quantification method

Yamane, Yuta*; Ieda, Junichi; Sinova, J.*

Physical Review B, 94(5), p.054409_1 - 054409_8, 2016/08

AA2016-0164.pdf:0.5MB

 Times Cited Count:16 Percentile:23.43(Materials Science, Multidisciplinary)

We formulate a theory of spin-transfer torques in antiferromagnets, which covers the small to large limits of the exchange coupling energy relative to the kinetic energy of the inter-sublattice electron dynamics. Our theory suggests a natural definition of the efficiency of spin-transfer torques in antiferromagnets in terms of well-defined material parameters, revealing that the charge current couples predominantly to the antiferromagnetic order parameter and the sublattice-canting moment in, respectively, the limits of large and small exchange coupling. The effects can be quantified by analyzing the antiferromagnetic spin-wave dispersions in the presence of charge current: in the limit of large exchange coupling the spin-wave Doppler shift always occurs, whereas, in the opposite limit, the only spin-wave modes to react to the charge current are ones that carry a pronounced sublattice-canting moment. The findings offer a framework for understanding and designing spin-transfer torques in antiferromagnets belonging to different classes of sublattice structures such as, e.g., bipartite and layered antiferromagnets.

Journal Articles

Incommensurate to commensurate antiferromagnetism in CeRhAl$$_4$$Si$$_2$$; An $$^{27}$$Al NMR study

Sakai, Hironori; Hattori, Taisuke; Tokunaga, Yo; Kambe, Shinsaku; Ghimire, N. J.*; Ronning, F.*; Bauer, E. D.*; Thompson, J. D.*

Physical Review B, 93(1), p.014402_1 - 014402_9, 2016/01

 Times Cited Count:1 Percentile:91.18(Materials Science, Multidisciplinary)

$$^{27}$$Al nuclear magnetic resonance (NMR) experiments have been performed on a single crystal of CeRhAl$$_4$$Si$$_2$$, which is an antiferromagnetic Kondo-lattice compound with successive antiferromagnetic transitions of $$T_{rm N1}$$=14 K and $$T_{rm N2}$$=9 K at zero external field. In the paramagnetic state, the Knight shifts, quadrupolar frequency, and asymmetric parameter of electrical field gradient on the Al sites have been determined, which have local orthorhombic symmetry. The transferred hyperfine coupling constants are also determined. Analysis of the NMR spectra indicates that a commensurate antiferromagnetic structure exists below $$T_{rm N2}$$, but an incommensurate modulation of antiferromagnetic moments is present in the antiferromagnetic state between $$T_{rm N1}$$ and $$T_{rm N2}$$. The spin-lattice relaxation rate suggests that the $$4f$$ electrons behave as local moments at temperatures above $$T_{rm N1}$$.

Journal Articles

Exotic field induced quantum phase transition of the kagome lattice antiferromagnet

Sakai, Toru; Nakano, Hiroki*

Physics Procedia, 75, p.821 - 828, 2015/12

 Times Cited Count:0 Percentile:100

The magnetization process of the S=1/2 kagome-lattice antiferromagnet is investigated using the numerical diagonalization up to 42-spin clusters. The critical exponent analysis confirms the unconventional magnetization behavior around the 1/3 magnetization plateau-like anomaly; the field derivative is infinite at the low-field side, while it is zero at the high-field side. We also confirm that a magnetization jump appears at 1/3 of the saturation magnetization in distorted kagome-lattice antiferromagnets.

Journal Articles

Magnetic field dependence of the canted spin moment around the interface between ferromagnetic Ni and antiferromagnetic FeMn revealed by the polarized neutron reflectivity

Amemiya, Kenta*; Sakamaki, Masako*; Mizusawa, Mari*; Takeda, Masayasu

JPS Conference Proceedings (Internet), 8, p.034004_1 - 034004_6, 2015/09

Journal Articles

Instability of a ferrimagnetic state of a frustrated S=1/2 Heisenberg antiferromagnet in two dimensions

Nakano, Hiroki*; Sakai, Toru

Japanese Journal of Applied Physics, 54(3), p.030305_1 - 030305_4, 2015/03

 Times Cited Count:9 Percentile:48.21(Physics, Applied)

To clarify the instability of the ferrimagnetism which is the fundamental magnetism of ferrite, numerical-diagonalization study is carried out for the two-dimensional S=1/2 Heisenberg antiferromagnet with frustration. We find that the ferrimagnetic ground state has the spontaneous magnetization in small frustration.

Journal Articles

Anomalous magnetic correlations in heavy fermion Pauli paramagnet UIr$$_3$$B$$_2$$; $$^{11}$$B NMR study

Fujimoto, Tatsuya; Sakai, Hironori; Tokunaga, Yo; Kambe, Shinsaku; Walstedt, R. E.; Ikeda, Shugo; Matsuda, Tatsuma; Haga, Yoshinori; Onuki, Yoshichika

Physica B; Condensed Matter, 378-380, p.997 - 998, 2006/05

 Times Cited Count:0 Percentile:100(Physics, Condensed Matter)

We report $$^{11}$$B NMR results of a single crystal UIr$$_3$$B$$_2$$. The measurement was performed by Fast Fourier Transformation technique, because spectral line width is extremely narrow ($$simeq$$ 10 kHz) and NMR occurs in quite limited r.f. band due to a good sample quality. From temperature variation of Knight shift and nuclear spin-lattice relaxation rate, the development of ferromagnetic correlations was clarified in the temperature range above $$T^{*} simeq 50$$ K. On the other hand, the magnetic dynamics was changed into another novel state below $$T^{*}$$; ferromagnetic correlations are restrained, meanwhile antiferromagnetic correlations are newly emerged. To explain this characteristic ground state, the one-dimensional $$5f$$ electrons state due to the unique structural lattice of UIr$$_3$$B$$_2$$ was proposed.

Journal Articles

Structure, magnetism and transport of the perovskite manganites $$Ln$$$$_{0.5}$$Ca$$_{0.5}$$MnO$$_{3}$$ ($$Ln$$=Ho, Er, Tm, Yb and Lu)

Yoshii, Kenji; Abe, Hideki*; Ikeda, Naoshi*

Journal of Solid State Chemistry, 178(12), p.3615 - 3623, 2005/12

 Times Cited Count:22 Percentile:33.64(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Magnetic structure and crystal field excitation in heavy fermion superconductor CePt$$_{3}$$Si

Metoki, Naoto; Kaneko, Koji; Matsuda, Tatsuma; Galatanu, A.; Takeuchi, Tetsuya*; Hashimoto, Shin*; Ueda, Taiki*; Settai, Rikio*; Onuki, Yoshichika*; Bernhoeft, N.*

Physica B; Condensed Matter, 359-361, p.383 - 385, 2005/06

 Times Cited Count:1 Percentile:93.13(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Magnetic field effect on the static antiferromagnetism of the electron-doped superconductor Pr$$_1-x$$LaCe$$_x$$CuO$$_4$$ (x=0.11 and 0.15)

Fujita, Masaki*; Matsuda, Masaaki; Katano, Susumu; Yamada, Kazuyoshi*

Physical Review Letters, 93(14), p.147003_1 - 147003_4, 2004/10

 Times Cited Count:24 Percentile:26.19(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Neutron diffraction and X-ray absorption study of CaMn$$_{0.6}$$Ru$$_{0.4}$$O$$_{3}$$

Yoshii, Kenji; Nakamura, Akio; Mizumaki, Masaichiro*; Tanida, Hajime*; Kawamura, Naomi*; Abe, Hideki*; Ishii, Yoshinobu; Shimojo, Yutaka; Morii, Yukio

Journal of Magnetism and Magnetic Materials, 272-276(Suppl.), p.e609 - e611, 2004/05

 Times Cited Count:4 Percentile:73.23(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Magnetic structure and the crystal field excitation in heavy-fermion antiferromagnetic superconductor CePt$$_{3}$$Si

Metoki, Naoto; Kaneko, Koji; Matsuda, Tatsuma; Galatanu, A.; Takeuchi, Tetsuya*; Hashimoto, Shin*; Ueda, Taiki*; Settai, Rikio*; Onuki, Yoshichika; Bernhoeft, N.*

Journal of Physics; Condensed Matter, 16(15), p.L207 - L212, 2004/04

 Times Cited Count:88 Percentile:5.79(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Magnetization plateaux of the ${it S}$=1/2 two-dimensional frustrated antiferromagnet Cs$$_{2}$$CuBr$$_{4}$$

Ono, Toshio*; Tanaka, Hidekazu*; Kolomiyets, O.*; Mitamura, Hiroyuki*; Goto, Tsuneaki*; Nakajima, Kenji; Osawa, Akira; Koike, Yoshihiro; Kakurai, Kazuhisa; Klenke, J.*; et al.

Journal of Physics; Condensed Matter, 16(11), p.S773 - S778, 2004/03

 Times Cited Count:56 Percentile:11.17(Physics, Condensed Matter)

no abstracts in English

86 (Records 1-20 displayed on this page)