[11] also found the surface potenti

[11] also found the surface potential
became more negative (in the range of )10 to
150 mV) after a PFPE lubricant was coated on copper
and aluminum substrates. The presence of surface
potential suggests that there would be a potential difference
between head and disk, when the head flies
over PFPE coated magnetic disk surfaces at small distances
due to charge induction on magnetic head.
However, there are relatively few studies on direct electrical
charge measurement at HDI. Using a
Laser-Doppler-Vibrometer (LDV) combined with a
lock-in amplifier, Knigge et al. [7] recently measured
contact potential at HDI. The authors reported the
contact potential at a typical HDI is _0.3 V with the
head positively charged, but ranged between )1 and
+1 V depending on the experimental setup.

Hasil (Bahasa Indonesia) 2:

[11] juga menemukan potensi permukaan
menjadi lebih negatif (dalam kisaran) 10 ke
150 mV) setelah pelumas PFPE dilapisi pada tembaga
dan aluminium substrat. Kehadiran permukaan
potensial menunjukkan bahwa akan ada perbedaan potensial
antara kepala dan disk, ketika kepala terbang
lebih PFPE dilapisi permukaan magnetic disk pada jarak kecil
karena biaya induksi pada kepala magnetik.
Namun, ada relatif sedikit studi tentang listrik langsung
biaya pengukuran pada HDI. Menggunakan
Laser-Doppler-Vibrometer (LDV) dikombinasikan dengan
lock-in amplifier, Knigge et al. [7] baru-baru ini diukur
potensial kontak di HDI. Para penulis melaporkan
potensi kontak pada HDI khas adalah _0.3 V dengan
kepala bermuatan positif, namun berkisar antara) 1 dan
1 V tergantung pada setup eksperimental.