journal article·2022-04-01Open access

New magnetic intermediate state, “B-phase,” in the cubic chiral magnet MnSi

M. Ohkuma, M. Mito, M. Pardo, Y. Kousaka, S. Iwasaki, K. Ohishi, J. Akimitsu, K. Inoue, V. Laliena, J. Campo

APL Materials· Volume 10· Issue 4

Abstract

It is well known that the archetype chiral magnet MnSi stabilizes a skyrmion lattice, termed “A-phase,” in a narrow temperature range in the vicinity of the paramagnetic boundary around Tc ∼ 29 K and Hc ∼ 2 kOe. Recently, it has been predicted that at much lower temperatures below Tc, the conical helicoid and the forced ferromagnetic (FFM) states could be separated by a new “unknown state.” In order to detect this “unknown state,” we explored the phase diagram of MnSi oriented single crystals as a function of the d.c. magnetic field (H⃗dc) and the temperature (T) by using a.c. magnetization measurements. For H⃗dc∥ 〈111〉, we observed a new region, termed “B-phase,” in the magnetic phase diagram, characterized by a flat-valley-like anomaly on the in-phase component of the a.c. magnetization (m′), over 3.5 ≤ Hdc ≤ 6.2 kOe just below the low temperature (T < 6 K) FFM boundary. The observed frequency independence over 0.3–1000 Hz and the absence of any measurable absorption in the a.c. magnetization (m″) in the “B-phase” suggest a static nature. The “B-phase” was not observed for either H⃗dc∥ 〈100〉 or 〈110〉, revealing that the magnetic anisotropy could play a role in the stabilization of the phase. The “B-phase” could be compatible with the theoretical predictions if the new magnetic state is supposedly related with a relative reorientation of the four helices in MnSi.
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Research context

OpenAlex topics: Magnetic properties of thin films · Magnetic and transport properties of perovskites and related materials · ZnO doping and properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Graduate School of Engineering, Kyushu Institute of Technology 1 , Kitakyushu 804-8550, Japan

Chirality Research Center, Hiroshima University 2 , Higashihiroshima 739-8526, Japan

Aragón Nanoscience and Materials Institute (CSIC–University of Zaragoza) and Physics Condensed Matter Department, Science Faculty 3 , C/ Pedro Cerbuna 12, 50009 Zaragoza, Spain

Graduate School of Science, Osaka Prefecture University 4 , 1-1 Gakuencho, Sakai, Osaka 599-8531, Japan

Department of Physics and Electronics, Osaka Prefecture University 5 , 1-1 Gakuencho, Sakai, Osaka 599-8531, Japan

Research Institute for Interdisciplinary Science, Okayama University 6 , Okayama 700-8530, Japan

Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS) 7 , Tokai, Ibaraki 319-1106, Japan

Graduate School of Science, Hiroshima University 8 , Higashihiroshima 739-8526, Japan

Institute for Advanced Materials Research, Hiroshima University 9 , Higashihiroshima 739-8526, Japan

Department of Applied Mathematics, University of Zaragoza 10 , C/ María de Luna 3, 50018 Zaragoza, Spain

Funding

Agencia Estatal de Investigación · Consejo Superior de Investigaciones Científicas · Japan Society for the Promotion of Science

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