Since the first shipping of Hard Disk Drives (HDDs) in 1956, the areal density of HDDs has rapidly increased with the dramatic spread of internet and it has reached 1 Tbit/in2. In order to increase the areal density further, new magnetic recording technologies have been proposed, such as heat assisted magnetic recording (HAMR), microwave assisted magnetic recording (MAMR) and all optical switching (AOS). HAMR and MAMR are very close to the mass production and further increase of the areal density will be achieved. Understanding of the underlying physics on the magnetic switching under the energy assistance will pave a way to reach ultra-high density magnetic recording with energy saving.
Recent advent of laser technologies realizes relativistic intensity laser light with over-picosecond (ps) pulse durations. Such ps lasers enable to study multiscale properties of high energy density plasmas where kinetic electron behavior, collisional processes, and also ion collective motion are important. This paper presents recent theory and simulation studies for the ps multiscale laser-plasma interactions.
In this article, we report a new property of supersymmetry (SUSY) breaking mass in modulus mediation of SUSY breaking. We show that the effect of renormalization group running is canceled by the threshold correction at one-loop level, if it is given by the nonperturbative effect controlled the same modulus mediating the SUSY breaking.
By using time- and angle-resolved photoemission spectroscopy, we investigate the ultrafast carrier dynamics in the series of (Sb, Bi)2 Te3. We show that the electronic recovery time for the surface Dirac fermions is prolonged to >400 ps when the charge neutrality point is approached. We also discuss the emergence of light-induced functionalizations such as surface photovoltage effect in the ultrafast time-domain. Our study strengthens the route toward the Dirac materials to be an opto-spintronic application.