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Probing the magnetic properties of ultrathin Pt/Mn bilayers
Pham, Thi Kim Hang,Ribeiro, Má,rio,Kim, Tae Hee Elsevier 2019 THIN SOLID FILMS - Vol.671 No.-
<P><B>Abstract</B></P> <P>We report on the interplay between surface morphology and the magnetic properties of Pt/Mn ultra-thin bilayers by measuring the temperature dependence of the resistivity of Hall bars cooled under application of an external magnetic field. The resistivity (<I>ρ</I>) versus temperature (<I>T</I>) curves measured under a magnetic field applied along the <I>x</I>-, <I>y</I>- and <I>z</I>- directions exhibit a clear difference between the zero-field-cooled (ZFC) and field-cooled (FC) traces. The disparity between the ZFC and FC traces allowed us to determine the direction of the magnetic easy-axis. The <I>ρ</I> vs. <I>T</I> characteristic of the Pt/Mn bilayers revealed the existence of antiferromagnetic (AF) order below 79 K, in agreement with the Néel temperature observed in temperature dependent susceptibility curves. We also investigated the morphological evolution of the Mn films as a function of Mn thickness by atomic force microscopy (AFM). We observed the formation of a Mn layered structure on a 2nm-thick Al<SUB>2</SUB>O<SUB>3</SUB> buffer layer for films thicker than 2.5 nm. Our results suggest that bilayer structures consisting of non-magnetic noble metals on ultra-thin antiferromagnetic metals can be used as a probe to explore the complex magnetic properties of the AF layer.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Surface magnetism of antiferromagnetic Mn films was probed using thin Pt/Mn bilayers. </LI> <LI> Transport properties of Pt were linked to magnetic properties of Mn films. </LI> <LI> Magnetic properties of Mn films were linked to surface morphology of Mn films. </LI> <LI> The Néel temperature and antiferromagnetic structure at Pt/Mn interfaces were determined. </LI> </UL> </P>
Decision making for Shipping Network based on Adaptive Cumulative Prospect Theory
Pham Thi Yen,Nguyen Phung Hung,Truong Ngoc Cuong,Hwan-Seong Kim 한국항해항만학회 2023 한국항해항만학회 학술대회논문집 Vol.2023 No.1
This paper aims to propose optimal method to assess and cumulate the daily profit for liner shipping to support the shipping lines in making optimal decision with the highest average daily profit. This paper not only explains the actual calculated results align with decision-makers’ behavior from concepts indicated in cumulative prospect theory but also contributes to an easy-to-apply method for liner shipping network predictability in and provides optimal decision-making is helpful for shipping managers for the best effective selection of the most appropriate alternative under uncertainties.
Temperature-Assisted Morphological Transition in CuPc Thin Films
배유정,Thi Kim Hang Pham,Tae Hee Kim 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.10
Ex-situ and in-situ morphological analyses were performed for Cu-phthalocyanine (CuPc) organic semiconductor films by using atomic force microscopy (AFM) and reflection high-energy electron diffraction (RHEED). The focus was the effects of post-annealing on the structural characteristics of CuPc films grown on MgO(001) layers by using an ultra-high-vacuum thermal evaporator. Sphere-to-nanofibril and 2-D to 3-D morphological transitions were observed with increasing CuPc thickness beyond 3 nm. The surface morphology and the crystallinity were drastically improved after an additional cooling of the post-annealed CuPc films thinner than 3 nm. Our results highlight that molecular orientation and structural ordering can be effectively controlled by using different temperature treatments and a proper combination of material, film thickness, and substrate.