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Antiferromagnetic coupling of van der Waals ferromagnetic Fe<sub>3</sub>GeTe<sub>2</sub>
Kim, Dongseuk,Park, Sijin,Lee, Jinhwan,Yoon, Jungbum,Joo, Sungjung,Kim, Taeyueb,Min, Kil-joon,Park, Seung-Young,Kim, Changsoo,Moon, Kyoung-Woong,Lee, Changgu,Hong, Jisang,Hwang, Chanyong IOP Pub 2019 Nanotechnology Vol.30 No.24
<P>Among two-dimensional (2D) layered van der Waals materials, ferromagnetic 2D materials can be useful for compact low-power spintronic applications. One promising candidate material is Fe<SUB>3</SUB>GeTe<SUB>2</SUB> (FGT), which has a strong perpendicular magnetic anisotropy and relatively high Curie temperature. In this study, we confirmed that an oxide layer (O-FGT) naturally forms on top of exfoliated FGT and that an antiferromagnetic coupling (AFC) exists between FGT and O-FGT layers. From a first-principles calculation, oxide formation at the interface of each layer induces an AFC between the layers. An AFC causes a tailed hysteresis loop, where two-magnetization reversal curves are included, and a negative remanence magnetization at a certain temperature range.</P>
Conductance of ultrathin Pt films
Yun Chang-Jin,Kim Jiho,Kim Mingu,Kim Dongseuk,황찬용,Lee B. C.,이긍원 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.5
Ultrathin Pt less than 10 nm thick is widely used in spintronic devices including spin Hall current. The transport property and underlying physics however have not been much studied for ultrathin films. Classical theories are analyzed to find that they cannot be applied to ultrathin films. Quantum mechanical size effect theory was applied to analyze Pt and Pt/CoFeB film sets. The quantum mechanical theory explained the conductance variation for both films along with roughness remarkably well.
Electrically Controlled Magnetoresistance in Ion-Gated Platinum Thin Films
Kil-Joon Min,Dong-Hun Chae,Dongseuk Kim,Jeehoon Jeon,김태엽,Sungjung Joo 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.5
Electric-field-induced correlated states of matter are an important topic in solid-state research. The recent revival of the ionic gating technique allows modulation of the carrier density even on metal surfaces. Here, we show that the anomalous magnetoresistance induced in ion-gated paramagnetic platinum thin films can be analyzed in the framework of an induced ferromagnetic phase on a platinum surface. The temperature dependence of the anomalous Hall component extracted from the observed superlinear Hall resistance was described well by using the Bloch equation for ferromagnetism. Moreover, a negative longitudinal magnetoresistance was observed at small angles between the film's plane and magnetic field, consistent with the behavior of ferromagnetic metal alloys.