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Strain-modulated helimagnetism and emergent magnetic phase diagrams in highly crystalline MnP nanorod films

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Abstract
We explore strain-modulated helimagnetism in highly crystalline MnP nanorod films grown on Si(100) substrates using molecular beam epitaxy. The strained MnP film exhibits a paramagnetic to ferromagnetic (FM) phase transition at T-C similar to 279K, and the FM to helical phase transition at T-N similar to 110K. The value of T-N is greater than T-N similar to 47K for the MnP single crystal, indicating strong strain-modulated helimagnetic states in the MnP nanorod film. The presence of significant thermal hysteresis in the helical phase indicates the coexistence of competing magnetic interactions, leading to the first-order metamagnetic transition. Similar to its single-crystal counterpart, an anisotropic magnetic effect is observed in the MnP film, which is independently confirmed by magnetic hysteresis loop and radio-frequency transverse susceptibility (TS) measurements. The evolution of the screw to the cone and fan phases is precisely tracked from magnetization vs magnetic field/temperature measurements. The temperature dependence of the anisotropy fields, extracted from the TS spectra, yields further insight into the competing nature of the magnetic phases. Unfolding of the different helical phases at T < 120K (similar to T-N) is analyzed by the temperature- and field-dependent magnetic entropy change. Based on these findings, the comprehensive magnetic phase diagrams of the MnP nanorod film are constructed for both the in-plane and out of plane magnetic field directions, revealing emergent strain/dimensionality-driven helical magnetic features that are absent in the magnetic phase diagram of the MnP single crystal.
Author(s)
Richa Pokharel MadhogariaChang-Ming HungBaleeswaraiah MuchharlaAnh Tuan DuongRaja DasPham Thanh Huy조성래Sarath WitanachchiHariharan SrikanthManh-Huong Phan
Issued Date
2021
Type
Article
Keyword
Magnetic anisotropyMagnetic orderPhase diagramsPhase transitionsMetamagnetism
DOI
10.1103/PhysRevB.103.184423
URI
https://oak.ulsan.ac.kr/handle/2021.oak/9530
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_crossref_primary_10_1103_PhysRevB_103_184423&amp;context=PC&amp;vid=ULSAN&amp;lang=ko_KR&amp;search_scope=default_scope&amp;adaptor=primo_central_multiple_fe&amp;tab=default_tab&amp;query=any,contains,Strain-modulated%20helimagnetism%20and%20emergent%20magnetic%20phase%20diagrams%20in%20highly%20crystalline%20MnP%20nanorod%20films&amp;offset=0&amp;pcAvailability=true
Publisher
PHYSICAL REVIEW B
Location
미국
Language
영어
ISSN
2469-9950
Citation Volume
103
Citation Number
18
Citation Start Page
184423
Citation End Page
184423
Appears in Collections:
Natural Science > Physics
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