KONFIGURASI FASA KOBALT (Co) DAN KARAKTERISTIK MAGNETORESISTANCE PADA PADUAN GRANULAR Co-C PASCA MILLING ENERGI TINGGI
| Main Authors: | Purwanto, Setyo, Sukirman, Engkir |
|---|---|
| Other Authors: | Pusat Sains dan Teknologi Bahan Maju (PSTBM) - BATAN |
| Format: | Article info application/pdf eJournal |
| Bahasa: | ind |
| Terbitan: |
BATAN
, 2017
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| Subjects: | |
| Online Access: |
http://jurnal.batan.go.id/index.php/jsmi/article/view/3966 http://jurnal.batan.go.id/index.php/jsmi/article/view/3966/3442 |
Daftar Isi:
- KONFIGURASI FASA KOBALT (Co) DAN KARAKTERISASI MAGNETORESISTANCE PADA PADUAN GRANULAR Co-C PASCA MILLING ENERGI TINGGI. Paduan granular Co-C dengan komposisi Co:C adalah 36: 64 telah dibuat dengan teknik milling energi tinggi selama masing-masing 4,5;12 dan 20 jam. Kemudian sampel dikarakterisasi dengan teknik X-Ray Diffractometer (XRD) yang menggunakan sumber CuKα. Selanjutnya sampel tersebut juga diukur sifat kurva histeresisnya dengan Vibrating Sample Magnetometer (VSM). Sifat nisbah magnetoresistance (MR) diukur dengan teknik Four Point Probe (FPP). Analisis profil XRD menunjukkan bahwa pada sampel pasca milling 4,5 dan 12 jam terdapat fasa a-Carbon, Co-HCP dan C-FCC. Adapun pada kurva magnetoresistance sampel-sampel tersebut menunjukkan kecenderungan positif. Sebaliknya pada sampel Co-C pasca milling 20jam diketahui adanya fasa baru yaitu Co3O4, selain fasa C, Co-HCP, Co-FCC dengan kecenderungan kurva MR berubah menjadi negatif.ABSTRACTCONFIGURATION OF Co PHASE AND MAGNETORESISTANCE PROPERTIES IN HIGH ENERGY MILLED Co-CGRANULAR COMPOUNDS. The Co-C granular compounds which composition of Co: C was 36:34 prepared using high energymilling (HEM) process for 4.5, 12 and 20 h. The samples were characterized using X-RayDiffraction with CuKα radiation. Subsequently, the magnetic hysteresis loop of the sampleswasmeasured by aVibrating SampleMagnetometer (VSM). Themagnetoresistance (MR)wasmeasured by standar Four Point Probe (FPP). The of XRD analyses show that a-Carbon, Co-HCP and C-FCC phases existed for the samples of 4.5 and 12 hours milling. Furthermore, the magnoresistance curves show positive trend for the sampples. On the other hand, Co3O4 phase beside of C, Co-HCP, Co-FCC phases existed with negative trend for magnoresistance curve for the samples of 20 hours milling.