Patent ID: 8593915

Claim:
A method of reading and writing on magnetic media having high coercivity and high anisotropy, comprising: providing a slider mounted read/write head further comprising: a TAMR mechanism including a plasmon antenna, a laser diode operable at various power levels to produce radiation in the optical frequency range and an optical waveguide for focusing said optical frequency radiation on said plasmon antenna, thereby causing surface plasmon near field energy of surface plasmons produced in said antenna to impinge on the magnetic media; a DFH mechanism for controlling a fly height of said slider; and a mechanism for preheating said antenna; then preheating said antenna to maintain a predetermined temperature and producing, thereby, a resulting protrusion of said antenna for which said DFH mechanism can react with sufficient speed to compensate by maintaining a substantially fixed distance between said antenna and said magnetic media; and then directing optical radiation from said laser diode onto said preheated antenna to produce a surface plasmon near field impinging on said magnetic media, said antenna attaining a final antenna temperature and an additional transient protrusion as a result of absorption of said optical radiation, but wherein additional DFH fly height compensation, when combined with that already produced as a result of said preheating, reduces the effects of said transient protrusion.