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Journal Articles

Thermal stability of non-collinear antiferromagnetic Mn$$_3$$Sn nanodot

Sato, Yuma*; Takeuchi, Yutaro*; Yamane, Yuta*; Yoon, J.-Y.*; Kanai, Shun*; Ieda, Junichi; Ohno, Hideo*; Fukami, Shunsuke*

Applied Physics Letters, 122(12), p.122404_1 - 122404_5, 2023/03

 Times Cited Count:0 Percentile:0(Physics, Applied)

Journal Articles

Local bifurcation with spin-transfer torque in superparamagnetic tunnel junctions

Funatsu, Takuya*; Kanai, Shun*; Ieda, Junichi; Fukami, Shunsuke*; Ohno, Hideo*

Nature Communications (Internet), 13, p.4079_1 - 4079_8, 2022/07

 Times Cited Count:2 Percentile:45.26(Multidisciplinary Sciences)

Modulation of the energy landscape by external perturbations governs various thermally-activated phenomena, described by the Arrhenius law. Thermal fluctuation of nanoscale magnetic tunnel junctions with spin-transfer torque (STT) shows promise for unconventional computing, whereas its rigorous representation, based on the Neel-Arrhenius law, has been controversial. In particular, the exponents for thermally-activated switching rate therein, have been inaccessible with conventional thermally-stable nanomagnets with decade-long retention time. Here we approach the Neel-Arrhenius law with STT utilising superparamagnetic tunnel junctions that have high sensitivity to external perturbations and determine the exponents through several independent measurements including homodyne-detected ferromagnetic resonance, nanosecond STT switching, and random telegraph noise. Furthermore, we show that the results are comprehensively described by a concept of local bifurcation observed in various physical systems. The findings demonstrate the capability of superparamagnetic tunnel junction as a useful tester for statistical physics as well as sophisticated engineering of probabilistic computing hardware with a rigorous mathematical foundation.

Journal Articles

Observation of domain structure in non-collinear antiferromagnetic Mn$$_3$$Sn thin films by magneto-optical Kerr effect

Uchimura, Tomohiro*; Yoon, J.-Y.*; Sato, Yuma*; Takeuchi, Yutaro*; Kanai, Shun*; Takechi, Ryota*; Kishi, Keisuke*; Yamane, Yuta*; DuttaGupta, S.*; Ieda, Junichi; et al.

Applied Physics Letters, 120(17), p.172405_1 - 172405_5, 2022/04

 Times Cited Count:8 Percentile:87.45(Physics, Applied)

Journal Articles

Chiral-spin rotation of non-collinear antiferromagnet by spin-orbit torque

Takeuchi, Yutaro*; Yamane, Yuta*; Yoon, J.-Y.*; Ito, Ryuichi*; Jinnai, Butsurin*; Kanai, Shun*; Ieda, Junichi; Fukami, Shunsuke*; Ohno, Hideo*

Nature Materials, 20(10), p.1364 - 1370, 2021/10

 Times Cited Count:62 Percentile:98.57(Chemistry, Physical)

Journal Articles

Correlation of anomalous Hall effect with structural parameters and magnetic ordering in Mn$$_{3+x}$$Sn$$_{1-x}$$ thin films

Yoon, J.-Y.*; Takeuchi, Yutaro*; DuttaGupta, S.*; Yamane, Yuta*; Kanai, Shun*; Ieda, Junichi; Ohno, Hideo*; Fukami, Shunsuke*

AIP Advances (Internet), 11(6), p.065318_1 - 065318_6, 2021/06

 Times Cited Count:12 Percentile:79.65(Nanoscience & Nanotechnology)

Journal Articles

Magnetization dynamics and its scattering mechanism in thin CoFeB films with interfacial anisotropy

Okada, Atsushi*; He, S.*; Gu, B.; Kanai, Shun*; Soumyanarayanan, A.*; Lim, S. T.*; Tran, M.*; Mori, Michiyasu; Maekawa, Sadamichi; Matsukura, Fumihiro*; et al.

Proceedings of the National Academy of Sciences of the United States of America, 144(15), p.3815 - 3820, 2017/04

Journal Articles

Thermal stability of a magnetic domain wall in nanowires

Fukami, Shunsuke*; Ieda, Junichi; Ohno, Hideo*

Physical Review B, 91(23), p.235401_1 - 235401_7, 2015/06

 Times Cited Count:21 Percentile:66.08(Materials Science, Multidisciplinary)

We study thermal stability of a magnetic domain wall pinned in nanowires made of Co/Ni multilayers, and analyze the effective volume that governs the thermal stability. We find that, above a critical wire width, the domain wall depinning is initiated by a subvolume excitation and that the critical width is dependent on the wire thickness. The obtained findings are supported by the distribution of critical current density for domain wall depinning and are qualitatively described by considering the balance between the Zeeman energy and domain wall elastic energy.

Journal Articles

Anomalous temperature dependence of current-induced torques in CoFeB/MgO heterostructures with Ta-based underlayers

Kim, J.*; Sinha, J.*; Mitani, Seiji*; Hayashi, Masamitsu*; Takahashi, Saburo*; Maekawa, Sadamichi; Yamanouchi, Michihiko*; Ohno, Hideo*

Physical Review B, 89(17), p.174424_1 - 174424_8, 2014/05

 Times Cited Count:88 Percentile:94.14(Materials Science, Multidisciplinary)

We have studied the underlayer thickness and temperature dependencies of the current-induced effective field in CoFeB/MgO heterostructures with Ta-based underlayers. The underlayer thickness at which the effective field saturates is found to be different between the two orthogonal components of the effective field; i.e., the dampinglike term tends to saturate at a smaller underlayer thickness than the fieldlike term. For large underlayer thickness films in which the effective field saturates, we find that the measurement temperature significantly influences the size of the effective field. A striking difference is found in the temperature dependence of the two components: the dampinglike term decreases whereas the fieldlike term increases with increasing temperature. Using a simple spin diffusion-spin transfer model, we find that all of these results can be accounted for provided the real and imaginary parts of an effective spin mixing conductance are negative. These results imply that either spin transport in this system is different from conventional metallic interfaces or effects other than spin diffusion into the magnetic layer need to be taken into account in order to model the system accurately.

Journal Articles

Reduction of intrinsic critical current density under a magnetic field along the hard axis of a free layer in a magnetic tunnel junction

Miura, Katsuya*; Sugano, Ryoko*; Ichimura, Masahiko*; Hayakawa, Jun*; Ikeda, Shoji*; Ohno, Hideo*; Maekawa, Sadamichi

Physical Review B, 84(17), p.174434_1 - 174434_7, 2011/11

 Times Cited Count:1 Percentile:5.45(Materials Science, Multidisciplinary)

Journal Articles

Magnetic circular dichroism in Mn 2p core absorption of Ga$$_{1-x}$$Mn$$_{x}$$As

Ueda, Shigenori*; Imada, Shin*; Muro, Takayuki*; Saito, Yuji; Suga, Shigemasa*; Matsukura, F.*; Ohno, Hideo*

Physica E, 10(1-3), p.210 - 214, 2001/05

 Times Cited Count:24 Percentile:74.08(Nanoscience & Nanotechnology)

no abstracts in English

Oral presentation

Influence of heavy ion irradiation on magnetic tunnel junctions

Kobayashi, Daisuke*; Kakehashi, Yuya*; Hirose, Kazuyuki*; Ikeda, Shoji*; Yamanouchi, Michihiko*; Sato, Hideo*; Enobio, E. C.*; Endo, Tetsuo*; Ohno, Hideo*; Onoda, Shinobu; et al.

no journal, , 

no abstracts in English

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