Measurement of Magnetic Properties Relevant to Heat-Assisted-Magnetic-Recording

Autor:	Ramamurthy Acharya, Antony Ajan, Hua Yuan, Thanh Le, David Treves, Alexander S. Chernyshov, Cristian Papusoi
Rok vydání:	2013
Předmět:	Magnetization Magnetic anisotropy Paramagnetism Materials science Condensed matter physics Magnetic energy Magnetic domain Heat-assisted magnetic recording Demagnetizing field Magnetic pressure Electrical and Electronic Engineering Electronic Optical and Magnetic Materials
Zdroj:	IEEE Transactions on Magnetics. 49:3572-3575
ISSN:	1941-0069 0018-9464
Popis:	Heat-assisted magnetic recording (HAMR) is likely the successor of perpendicular magnetic recording (PMR) technology. The quality of HAMR writing is dominated not by the magnetic field gradient (as in PMR), but by the high thermal gradient generated by the laser heating spot. Knowledge of temperature dependence of magnetic parameters: anisotropy field Hk(T), saturation moment Ms(T) and anisotropy field distribution (δHk) the proximity of Curie temperature is crucial for media development. Here we describe a new system to probe the magnetic properties close to Tc, as well as a semianalytical model to explain the results. The model takes into account the thermal fluctuations; input into the model are experimentally measured data for Ms(T), Hk(T), mean field demagnetization factor, σHk and grain size distribution. In the paper we present two types of data: 1) thermal erasure in the absence of a magnetic field; and 2) thermomagnetic writing, allowing the estimate of the switching field distribution at high temperatures.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4babcf4ca267e5f7e679cbe8a8a72c5b https://doi.org/10.1109/tmag.2013.2246817 Zobrazit plný text záznamu