Current-induced synchronized switching of magnetization

We investigate current-induced magnetization switching for a multilayer structure that allows a reduced switching current while maintaining high thermal stability of the magnetization. The structure consists of a perpendicular polarizer, a perpendicular free-layer, and an additional free-layer having in-plane magnetization. When the current runs perpendicular to the structure, the in-plane free-layer undergoes a precession and supplies an internal rf field to the perpendicular free-layer, resulting in a reduced switching current for one current polarity. For the other polarity, the in-plane free-layer almost saturates perpendicular to the plane and acts as another perpendicular polarizer, which also reduces the switching current.Comment: 18 pages, 4 figure

Forbidden Channels and SIMP Dark Matter

In this review, we focus on dark matter production from thermal freeze-out with forbidden channels and SIMP processes. We show that forbidden channels can be dominant to produce dark matter depending on the dark photon and / or dark Higgs mass compared to SIMP.Comment: 5 pages, Prepared for the proceedings of the 13th International Conference on Gravitation, 3-7 July 201

Paradoxes of Difference

A new play tackles the politics around race and gender in scienc

Is \u3ci\u3eSky Reefer\u3c/i\u3e in Jeopardy? The MLA\u27s Proposed Changes to Maritime Foreign Arbitration Clauses

After almost sixty years of change in the international commercial arena, the United States needs to revise its maritime law to reflect international practice. Recently, the U.S. Supreme Court, in Vimar Seguros y Reaseguros, S.A. v. MIV Sky Reefer, held that foreign arbitration clauses in maritime bills of lading will be enforced. In an attempt to reverse this decision, the Maritime Law Association included in its proposal to revise the Carriage of the Goods by Sea Act a clause that specifically denies the enforcement of foreign arbitration clauses. This Comment argues that Congress should not adopt the proposed revision because maritime commerce is not confined within national borders, and the United States should continue to align its practices with international expectations. In particular, this Comment asserts that, although as a whole the proposed revision would be beneficial, the Maritime Law Association should reconsider the issue of enforcing foreign arbitration clauses in bills of lading

On thermal production of self-interacting dark matter

We consider thermal production mechanisms of self-interacting dark matter in models with gauged $Z_3$ symmetry. A complex scalar dark matter is stabilized by the $Z_3$, that is the remnant of a local dark $U(1)_d$. Light dark matter with large self-interaction can be produced from thermal freeze-out in the presence of SM-annihilation, SIMP and/or forbidden channels. We show that dark photon and/or dark Higgs should be relatively light for unitarity and then assist the thermal freeze-out. We identify the constraints on the parameter space of dark matter self-interaction and mass in cases that one or some of the channels are important in determining the relic density.Comment: 26 pages, 11 figures, Version to appear in Journal of High Energy Physic