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http://dx.doi.org/10.4283/JKMS.2004.14.3.089

Magnetic Properties of Monolayer-thiciness InP(001)(2×4) Reconstruction Surface  

Park, Yong-Sung (한국과학기술원 물리학과 및 스핀정보물질연구단)
Jeong, Jong-Ryul (한국과학기술원 물리학과 및 스핀정보물질연구)
Lee, Jeong-Won (한국과학기술원 물리학과 및 스핀정보물질연구)
Shin, Sung-Chul (한국과학기술원 물리학과 및 스핀정보물질연구단)
Abstract
We have investigated magnetic properties of monolayer (ML)-thickness Co film deposited on InP(2${\times}$4) reconstruction surface using in situ Surface Magneto-Optical Kerr Effects (SMOKE) measurement system. InP(2${\times}$4) reconstruction surface, obtained by repeated sputtering and annealing, was confirmed by reflection hish energy electron diffraction (RHEED) and scanning tunneling microscope (STM) measurements. From both longitudinal and polar SMOKE measurements, we have observed three distinguishable regions showing different magnetic properties depending on the Co thickness. In the Co film thickness smaller than 7 $m\ell$, no SMOKE signal was detected. In the following thickness between 8 $m\ell$ and 15 $m\ell$, both longitudinal and polar Kerr hysteresis loops were observed, which implies a metastable phase coexisted of in-plane and perpendicular anisotropies. In the film thickness larger than 16 $m\ell$, only longitudinal MOKE signal without polar signal was detected, which implies existence of in-plane anisotropy in this thickness region.
Keywords
$InP(2{\times}4)$ substrate; STM; SMOKE; Co film;
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