New Ionic Lubricants for Magnetic Thin-Film Media

Author

Kondo, Hiroki ; Hatsuda, Kouki ; Tano, Nobuo ; Ito, Minora ; Kyungsung Yun ; Watanabe, Manabu

Author_Institution

Dexerials Corp., Tochigi, Japan

Volume

50

Issue

11

fYear

2014

fDate

Nov. 2014

Firstpage

1

Lastpage

4

Abstract

This paper deals with the effect of the molecular structure of the newly synthesized protic ionic liquids (PILs) on the tribological and thermal properties. A higher ΔpK_a between the acid and base is effective for the thermal durability. It is more effective for the thermal stability to modify the sulfonate with a super base, and the DBU and TBD derivatives have decomposition temperatures greater than 420 °C. The PILs are adsorbed on the media surface with a high orientation. The stronger adsorption due to the intensive adhesive interaction of the polar group is necessary for the friction reduction. A sufficient length of the hydrocarbon chain causes an extensive cohesive interaction, which compensates for the mechanical durability.

Keywords

adhesion; adsorption; cobalt; durability; friction; liquid structure; lubricants; magnetic thin films; organic compounds; pyrolysis; thermal stability; 1,5,7-triazabicyclo[4.4.0]dec-5-ene; 1,8-diazabicyclo[5.4.0]undec-7-ene; Co; DBU derivatives; TBD derivatives; adsorption; decomposition temperatures; extensive cohesive interaction; friction reduction; hydrocarbon chain; intensive adhesive interaction; ionic lubricants; magnetic thin-film media; mechanical durability; molecular structure; protic ionic liquids; sulfonate; thermal durability; thermal stability; tribological properties; Friction; Lubricants; Magnetic liquids; Magnetic recording; Media; Stability analysis; Thermal stability; Friction; heat-assisted magnetic recording; lubricant; thermal stability;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2014.2320272

Filename

6971499